161740880 has 40 divisors (see below), whose sum is σ = 429770112. Its totient is φ = 55453824.

The previous prime is 161740877. The next prime is 161740883. The reversal of 161740880 is 88047161.

It is an interprime number because it is at equal distance from previous prime (161740877) and next prime (161740883).

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×161740880² = 52320224526348800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a self number, because there is not a number n which added to its sum of digits gives 161740880.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161740883) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 143852 + ... + 144971.

Almost surely, 2^161740880 is an apocalyptic number.

161740880 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161740880 is an abundant number, since it is smaller than the sum of its proper divisors (268029232).

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

161740880 is a wasteful number, since it uses less digits than its factorization.

161740880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 288843 (or 288837 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 35.

The square root of 161740880 is about 12717.7387927257. The cubic root of 161740880 is about 544.8453731860.

The spelling of 161740880 in words is "one hundred sixty-one million, seven hundred forty thousand, eight hundred eighty".