28147972 has 24 divisors (see below), whose sum is σ = 51778496. Its totient is φ = 13372128.

The previous prime is 28147939. The next prime is 28147979. The reversal of 28147972 is 27974182.

It is not an unprimeable number, because it can be changed into a prime (28147979) 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, 4153 + ... + 8575.

Almost surely, 2^28147972 is an apocalyptic number.

It is an amenable number.

28147972 is a deficient number, since it is larger than the sum of its proper divisors (23630524).

28147972 is a wasteful number, since it uses less digits than its factorization.

28147972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4507 (or 4505 counting only the distinct ones).

The product of its digits is 56448, while the sum is 40.

The square root of 28147972 is about 5305.4662377589. The cubic root of 28147972 is about 304.1928744875.

The spelling of 28147972 in words is "twenty-eight million, one hundred forty-seven thousand, nine hundred seventy-two".