28537390 has 32 divisors (see below), whose sum is σ = 62161344. Its totient is φ = 9208320.

The previous prime is 28537367. The next prime is 28537417. The reversal of 28537390 is 9373582.

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, 10801 + ... + 13180.

It is an arithmetic number, because the mean of its divisors is an integer number (1942542).

Almost surely, 2^28537390 is an apocalyptic number.

28537390 is an abundant number, since it is smaller than the sum of its proper divisors (33623954).

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

28537390 is a wasteful number, since it uses less digits than its factorization.

28537390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24012.

The product of its (nonzero) digits is 45360, while the sum is 37.

The square root of 28537390 is about 5342.0398725580. The cubic root of 28537390 is about 305.5892576722.

It can be divided in two parts, 285 and 37390, that added together give a triangular number (37675 = T₂₇₄).

The spelling of 28537390 in words is "twenty-eight million, five hundred thirty-seven thousand, three hundred ninety".