28049972 has 24 divisors (see below), whose sum is σ = 51408000. Its totient is φ = 13366496.

The previous prime is 28049971. The next prime is 28049999. The reversal of 28049972 is 27994082.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28049971) 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, 46529 + ... + 47127.

It is an arithmetic number, because the mean of its divisors is an integer number (2142000).

Almost surely, 2^28049972 is an apocalyptic number.

It is an amenable number.

28049972 is a deficient number, since it is larger than the sum of its proper divisors (23358028).

28049972 is a wasteful number, since it uses less digits than its factorization.

28049972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1135 (or 1133 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 41.

The square root of 28049972 is about 5296.2224273533. Note that the first 3 decimals coincide. The cubic root of 28049972 is about 303.8394379495.

The spelling of 28049972 in words is "twenty-eight million, forty-nine thousand, nine hundred seventy-two".