161638708 has 24 divisors (see below), whose sum is σ = 352666944. Its totient is φ = 62976000.

The previous prime is 161638699. The next prime is 161638723. The reversal of 161638708 is 807836161.

It is a super-2 number, since 2×161638708² = 52254143847818528, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 262093 + ... + 262708.

It is an arithmetic number, because the mean of its divisors is an integer number (14694456).

Almost surely, 2^161638708 is an apocalyptic number.

It is an amenable number.

161638708 is an abundant number, since it is smaller than the sum of its proper divisors (191028236).

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

161638708 is a wasteful number, since it uses less digits than its factorization.

161638708 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 524823 (or 524821 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 40.

The square root of 161638708 is about 12713.7212491072. The cubic root of 161638708 is about 544.7306224245.

The spelling of 161638708 in words is "one hundred sixty-one million, six hundred thirty-eight thousand, seven hundred eight".