161660928 has 240 divisors, whose sum is σ = 528466176. Its totient is φ = 43253760.

The previous prime is 161660899. The next prime is 161660929. The reversal of 161660928 is 829066161.

It is a super-2 number, since 2×161660928² = 52268511283642368, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161660929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7028725 + ... + 7028747.

Almost surely, 2^161660928 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 161660928, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (264233088).

161660928 is an abundant number, since it is smaller than the sum of its proper divisors (366805248).

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

161660928 is a wasteful number, since it uses less digits than its factorization.

161660928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78 (or 52 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 39.

The square root of 161660928 is about 12714.5950780982. The cubic root of 161660928 is about 544.7555821222.

The spelling of 161660928 in words is "one hundred sixty-one million, six hundred sixty thousand, nine hundred twenty-eight".