161305672 has 16 divisors (see below), whose sum is σ = 329943600. Its totient is φ = 73320720.

The previous prime is 161305657. The next prime is 161305699. The reversal of 161305672 is 276503161.

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, 916422 + ... + 916597.

It is an arithmetic number, because the mean of its divisors is an integer number (20621475).

Almost surely, 2^161305672 is an apocalyptic number.

It is an amenable number.

161305672 is an abundant number, since it is smaller than the sum of its proper divisors (168637928).

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

161305672 is a wasteful number, since it uses less digits than its factorization.

161305672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1833036 (or 1833032 counting only the distinct ones).

The product of its (nonzero) digits is 7560, while the sum is 31.

The square root of 161305672 is about 12700.6169928866. The cubic root of 161305672 is about 544.3562491350.

The spelling of 161305672 in words is "one hundred sixty-one million, three hundred five thousand, six hundred seventy-two".