28980172 has 24 divisors (see below), whose sum is σ = 57830976. Its totient is φ = 12588288.

The previous prime is 28980169. The next prime is 28980173. The reversal of 28980172 is 27108982.

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (28980173) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15508 + ... + 17275.

It is an arithmetic number, because the mean of its divisors is an integer number (2409624).

Almost surely, 2^28980172 is an apocalyptic number.

It is an amenable number.

28980172 is a deficient number, since it is larger than the sum of its proper divisors (28850804).

28980172 is a wasteful number, since it uses less digits than its factorization.

28980172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32817 (or 32815 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 37.

The square root of 28980172 is about 5383.3235087630. The cubic root of 28980172 is about 307.1616460318.

The spelling of 28980172 in words is "twenty-eight million, nine hundred eighty thousand, one hundred seventy-two".