161795904 has 56 divisors (see below), whose sum is σ = 431279808. Its totient is φ = 53529600.

The previous prime is 161795867. The next prime is 161795917. The reversal of 161795904 is 409597161.

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, 23229 + ... + 29379.

Almost surely, 2^161795904 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 161795904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (215639904).

161795904 is an abundant number, since it is smaller than the sum of its proper divisors (269483904).

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

161795904 is a wasteful number, since it uses less digits than its factorization.

161795904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6303 (or 6293 counting only the distinct ones).

The product of its (nonzero) digits is 68040, while the sum is 42.

The square root of 161795904 is about 12719.9018864141. The cubic root of 161795904 is about 544.9071513685.

The spelling of 161795904 in words is "one hundred sixty-one million, seven hundred ninety-five thousand, nine hundred four".