28031888 has 10 divisors (see below), whose sum is σ = 54311814. Its totient is φ = 14015936.

The previous prime is 28031873. The next prime is 28031891. The reversal of 28031888 is 88813082.

It can be written as a sum of positive squares in only one way, i.e., 21641104 + 6390784 = 4652^2 + 2528^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 875981 + ... + 876012.

Almost surely, 2^28031888 is an apocalyptic number.

It is an amenable number.

28031888 is a deficient number, since it is larger than the sum of its proper divisors (26279926).

28031888 is a wasteful number, since it uses less digits than its factorization.

28031888 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1752001 (or 1751995 counting only the distinct ones).

The product of its (nonzero) digits is 24576, while the sum is 38.

The square root of 28031888 is about 5294.5148975142. The cubic root of 28031888 is about 303.7741281561.

The spelling of 28031888 in words is "twenty-eight million, thirty-one thousand, eight hundred eighty-eight".