28724232 has 16 divisors (see below), whose sum is σ = 71810640. Its totient is φ = 9574736.

The previous prime is 28724221. The next prime is 28724233. The reversal of 28724232 is 23242782.

It is a self number, because there is not a number n which added to its sum of digits gives 28724232.

It is not an unprimeable number, because it can be changed into a prime (28724233) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 598398 + ... + 598445.

It is an arithmetic number, because the mean of its divisors is an integer number (4488165).

Almost surely, 2^28724232 is an apocalyptic number.

It is an amenable number.

28724232 is an abundant number, since it is smaller than the sum of its proper divisors (43086408).

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

28724232 is a wasteful number, since it uses less digits than its factorization.

28724232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1196852 (or 1196848 counting only the distinct ones).

The product of its digits is 10752, while the sum is 30.

The square root of 28724232 is about 5359.4992303386. The cubic root of 28724232 is about 306.2547325660.

The spelling of 28724232 in words is "twenty-eight million, seven hundred twenty-four thousand, two hundred thirty-two".