28553872 has 10 divisors (see below), whose sum is σ = 55323158. Its totient is φ = 14276928.

The previous prime is 28553869. The next prime is 28553881. The reversal of 28553872 is 27835582.

It can be written as a sum of positive squares in only one way, i.e., 23464336 + 5089536 = 4844^2 + 2256^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 892293 + ... + 892324.

Almost surely, 2^28553872 is an apocalyptic number.

It is an amenable number.

28553872 is a deficient number, since it is larger than the sum of its proper divisors (26769286).

28553872 is a wasteful number, since it uses less digits than its factorization.

28553872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1784625 (or 1784619 counting only the distinct ones).

The product of its digits is 134400, while the sum is 40.

The square root of 28553872 is about 5343.5823190066. The cubic root of 28553872 is about 305.6480781973.

The spelling of 28553872 in words is "twenty-eight million, five hundred fifty-three thousand, eight hundred seventy-two".