28531488 has 48 divisors (see below), whose sum is σ = 75176640. Its totient is φ = 9474816.

The previous prime is 28531487. The next prime is 28531507. The reversal of 28531488 is 88413582.

It is a tau number, because it is divible by the number of its divisors (48).

It is not an unprimeable number, because it can be changed into a prime (28531487) 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, 41806 + ... + 42482.

It is an arithmetic number, because the mean of its divisors is an integer number (1566180).

Almost surely, 2^28531488 is an apocalyptic number.

It is an amenable number.

28531488 is an abundant number, since it is smaller than the sum of its proper divisors (46645152).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28531488 is a wasteful number, since it uses less digits than its factorization.

28531488 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1129 (or 1121 counting only the distinct ones).

The product of its digits is 61440, while the sum is 39.

The square root of 28531488 is about 5341.4874332905. The cubic root of 28531488 is about 305.5681892640.

The spelling of 28531488 in words is "twenty-eight million, five hundred thirty-one thousand, four hundred eighty-eight".