28770972 has 12 divisors (see below), whose sum is σ = 67132296. Its totient is φ = 9590320.

The previous prime is 28770943. The next prime is 28771009. The reversal of 28770972 is 27907782.

It is a tau number, because it is divible by the number of its divisors (12).

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors.

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, 1198779 + ... + 1198802.

It is an arithmetic number, because the mean of its divisors is an integer number (5594358).

Almost surely, 2^28770972 is an apocalyptic number.

It is an amenable number.

28770972 is an abundant number, since it is smaller than the sum of its proper divisors (38361324).

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

28770972 is a wasteful number, since it uses less digits than its factorization.

28770972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2397588 (or 2397586 counting only the distinct ones).

The product of its (nonzero) digits is 98784, while the sum is 42.

The square root of 28770972 is about 5363.8579399533. The cubic root of 28770972 is about 306.4207548653.

The spelling of 28770972 in words is "twenty-eight million, seven hundred seventy thousand, nine hundred seventy-two".