161692740 has 192 divisors, whose sum is σ = 555448320. Its totient is φ = 38724480.

The previous prime is 161692711. The next prime is 161692753. The reversal of 161692740 is 47296161.

It is a super-2 number, since 2×161692740² = 52289084337415200, 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 junction number, because it is equal to n+sod(n) for n = 161692695 and 161692704.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 968137 + ... + 968303.

It is an arithmetic number, because the mean of its divisors is an integer number (2892960).

Almost surely, 2^161692740 is an apocalyptic number.

161692740 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 161692740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (277724160).

161692740 is an abundant number, since it is smaller than the sum of its proper divisors (393755580).

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

161692740 is a wasteful number, since it uses less digits than its factorization.

161692740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 359 (or 351 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 36.

The square root of 161692740 is about 12715.8460198290. The cubic root of 161692740 is about 544.7913125204.

The spelling of 161692740 in words is "one hundred sixty-one million, six hundred ninety-two thousand, seven hundred forty".