28724250 has 32 divisors (see below), whose sum is σ = 71697600. Its totient is φ = 7659600.

The previous prime is 28724233. The next prime is 28724279. The reversal of 28724250 is 5242782.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18400 + ... + 19899.

It is an arithmetic number, because the mean of its divisors is an integer number (2240550).

Almost surely, 2^28724250 is an apocalyptic number.

28724250 is an abundant number, since it is smaller than the sum of its proper divisors (42973350).

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

28724250 is a wasteful number, since it uses less digits than its factorization.

28724250 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38319 (or 38309 counting only the distinct ones).

The product of its (nonzero) digits is 8960, while the sum is 30.

The square root of 28724250 is about 5359.5009095997. The cubic root of 28724250 is about 306.2547965374.

The spelling of 28724250 in words is "twenty-eight million, seven hundred twenty-four thousand, two hundred fifty".