28437240 has 64 divisors (see below), whose sum is σ = 91879200. Its totient is φ = 6999552.

The previous prime is 28437239. The next prime is 28437251. The reversal of 28437240 is 4273482.

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

It is a junction number, because it is equal to n+sod(n) for n = 28437198 and 28437207.

It is a congruent number.

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, 7555 + ... + 10674.

Almost surely, 2^28437240 is an apocalyptic number.

28437240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28437240 is an abundant number, since it is smaller than the sum of its proper divisors (63441960).

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

28437240 is a wasteful number, since it uses less digits than its factorization.

28437240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18256 (or 18252 counting only the distinct ones).

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

The square root of 28437240 is about 5332.6578738937. The cubic root of 28437240 is about 305.2313572021.

The spelling of 28437240 in words is "twenty-eight million, four hundred thirty-seven thousand, two hundred forty".