28401232 has 20 divisors (see below), whose sum is σ = 55231956. Its totient is φ = 14147840.

The previous prime is 28401229. The next prime is 28401259. The reversal of 28401232 is 23210482.

It can be written as a sum of positive squares in 2 ways, for example, as 17272336 + 11128896 = 4156^2 + 3336^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1338 + ... + 7654.

Almost surely, 2^28401232 is an apocalyptic number.

It is an amenable number.

28401232 is a deficient number, since it is larger than the sum of its proper divisors (26830724).

28401232 is a wasteful number, since it uses less digits than its factorization.

28401232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6606 (or 6600 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 22.

The square root of 28401232 is about 5329.2806268764. The cubic root of 28401232 is about 305.1024720629.

The spelling of 28401232 in words is "twenty-eight million, four hundred one thousand, two hundred thirty-two".