161294728 has 32 divisors (see below), whose sum is σ = 350798400. Its totient is φ = 68092992.

The previous prime is 161294713. The next prime is 161294737. The reversal of 161294728 is 827492161.

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, 17743 + ... + 25246.

It is an arithmetic number, because the mean of its divisors is an integer number (10962450).

Almost surely, 2^161294728 is an apocalyptic number.

It is an amenable number.

161294728 is an abundant number, since it is smaller than the sum of its proper divisors (189503672).

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

161294728 is a wasteful number, since it uses less digits than its factorization.

161294728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43069 (or 43065 counting only the distinct ones).

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

The square root of 161294728 is about 12700.1861403682. The cubic root of 161294728 is about 544.3439379963.

The spelling of 161294728 in words is "one hundred sixty-one million, two hundred ninety-four thousand, seven hundred twenty-eight".