28120972 has 24 divisors (see below), whose sum is σ = 54492480. Its totient is φ = 12590160.

The previous prime is 28120949. The next prime is 28121017. The reversal of 28120972 is 27902182.

It is an unprimeable number.

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, 1822 + ... + 7717.

It is an arithmetic number, because the mean of its divisors is an integer number (2270520).

Almost surely, 2^28120972 is an apocalyptic number.

28120972 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

28120972 is a deficient number, since it is larger than the sum of its proper divisors (26371508).

28120972 is a wasteful number, since it uses less digits than its factorization.

28120972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9621 (or 9619 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 28120972 is about 5302.9210818190. The cubic root of 28120972 is about 304.0955810946.

It can be divided in two parts, 28120 and 972, that added together give a palindrome (29092).

The spelling of 28120972 in words is "twenty-eight million, one hundred twenty thousand, nine hundred seventy-two".