161599724 has 48 divisors (see below), whose sum is σ = 339365376. Its totient is φ = 66350400.

The previous prime is 161599723. The next prime is 161599727. The reversal of 161599724 is 427995161.

It is a super-2 number, since 2×161599724² = 52228941593752352, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is not an unprimeable number, because it can be changed into a prime (161599723) 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 15 ways as a sum of consecutive naturals, for example, 23879 + ... + 29889.

It is an arithmetic number, because the mean of its divisors is an integer number (7070112).

Almost surely, 2^161599724 is an apocalyptic number.

It is an amenable number.

161599724 is an abundant number, since it is smaller than the sum of its proper divisors (177765652).

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

161599724 is a wasteful number, since it uses less digits than its factorization.

161599724 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6086 (or 6084 counting only the distinct ones).

The product of its digits is 136080, while the sum is 44.

The square root of 161599724 is about 12712.1880099375. The cubic root of 161599724 is about 544.6868262194.

The spelling of 161599724 in words is "one hundred sixty-one million, five hundred ninety-nine thousand, seven hundred twenty-four".