161763920 has 20 divisors (see below), whose sum is σ = 376101300. Its totient is φ = 64705536.

The previous prime is 161763919. The next prime is 161763941. The reversal of 161763920 is 29367161.

It can be written as a sum of positive squares in 2 ways, for example, as 93470224 + 68293696 = 9668^2 + 8264^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1010945 + ... + 1011104.

It is an arithmetic number, because the mean of its divisors is an integer number (18805065).

Almost surely, 2^161763920 is an apocalyptic number.

161763920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161763920 is an abundant number, since it is smaller than the sum of its proper divisors (214337380).

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

161763920 is a wasteful number, since it uses less digits than its factorization.

161763920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2022062 (or 2022056 counting only the distinct ones).

The product of its (nonzero) digits is 13608, while the sum is 35.

The square root of 161763920 is about 12718.6445818727. The cubic root of 161763920 is about 544.8712430452.

The spelling of 161763920 in words is "one hundred sixty-one million, seven hundred sixty-three thousand, nine hundred twenty".