28972856 has 32 divisors (see below), whose sum is σ = 61311600. Its totient is φ = 12714240.

The previous prime is 28972843. The next prime is 28972859. The reversal of 28972856 is 65827982.

It is a self number, because there is not a number n which added to its sum of digits gives 28972856.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28972859) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3125 + ... + 8228.

Almost surely, 2^28972856 is an apocalyptic number.

It is an amenable number.

28972856 is an abundant number, since it is smaller than the sum of its proper divisors (32338744).

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

28972856 is a wasteful number, since it uses less digits than its factorization.

28972856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11399 (or 11395 counting only the distinct ones).

The product of its digits is 483840, while the sum is 47.

The square root of 28972856 is about 5382.6439599884. The cubic root of 28972856 is about 307.1357963609.

The spelling of 28972856 in words is "twenty-eight million, nine hundred seventy-two thousand, eight hundred fifty-six".