28507224 has 16 divisors (see below), whose sum is σ = 71268120. Its totient is φ = 9502400.

The previous prime is 28507217. The next prime is 28507231. The reversal of 28507224 is 42270582.

It is an interprime number because it is at equal distance from previous prime (28507217) and next prime (28507231).

It is a junction number, because it is equal to n+sod(n) for n = 28507191 and 28507200.

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, 593877 + ... + 593924.

Almost surely, 2^28507224 is an apocalyptic number.

28507224 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

28507224 is an abundant number, since it is smaller than the sum of its proper divisors (42760896).

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

28507224 is a wasteful number, since it uses less digits than its factorization.

28507224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1187810 (or 1187806 counting only the distinct ones).

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

The square root of 28507224 is about 5339.2156727370. The cubic root of 28507224 is about 305.4815433646.

The spelling of 28507224 in words is "twenty-eight million, five hundred seven thousand, two hundred twenty-four".