161693280 has 192 divisors, whose sum is σ = 646894080. Its totient is φ = 36951552.

The previous prime is 161693263. The next prime is 161693297. The reversal of 161693280 is 82396161.

161693280 is a `hidden beast` number, since 1 + 616 + 9 + 32 + 8 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (161693263) and next prime (161693297).

It is a super-2 number, since 2×161693280² = 52289433594316800, which contains 22 as substring.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 27567 + ... + 32913.

It is an arithmetic number, because the mean of its divisors is an integer number (3369240).

Almost surely, 2^161693280 is an apocalyptic number.

161693280 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 161693280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (323447040).

161693280 is an abundant number, since it is smaller than the sum of its proper divisors (485200800).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

161693280 is a wasteful number, since it uses less digits than its factorization.

161693280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5378 (or 5364 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

The square root of 161693280 is about 12715.8672531605. The cubic root of 161693280 is about 544.7919189936.

The spelling of 161693280 in words is "one hundred sixty-one million, six hundred ninety-three thousand, two hundred eighty".