28751400 has 72 divisors (see below), whose sum is σ = 96562830. Its totient is φ = 7666560.

The previous prime is 28751399. The next prime is 28751417. The reversal of 28751400 is 415782.

It can be written as a sum of positive squares in 3 ways, for example, as 24265476 + 4485924 = 4926^2 + 2118^2 .

It is a tau number, because it is divible by the number of its divisors (72).

It is a nialpdrome in base 12.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 6187 + ... + 9786.

Almost surely, 2^28751400 is an apocalyptic number.

28751400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28751400 is an abundant number, since it is smaller than the sum of its proper divisors (67811430).

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

28751400 is a wasteful number, since it uses less digits than its factorization.

28751400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15995 (or 15983 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 27.

The square root of 28751400 is about 5362.0331964657. The cubic root of 28751400 is about 306.3512562581.

The spelling of 28751400 in words is "twenty-eight million, seven hundred fifty-one thousand, four hundred".