28713625 has 24 divisors (see below), whose sum is σ = 37491480. Its totient is φ = 21929600.

The previous prime is 28713613. The next prime is 28713667. The reversal of 28713625 is 52631782.

It is a happy number.

It can be written as a sum of positive squares in 12 ways, for example, as 26915344 + 1798281 = 5188^2 + 1341^2 .

It is a de Polignac number, because none of the positive numbers 2^k-28713625 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 322581 + ... + 322669.

It is an arithmetic number, because the mean of its divisors is an integer number (1562145).

Almost surely, 2^28713625 is an apocalyptic number.

28713625 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28713625 is a deficient number, since it is larger than the sum of its proper divisors (8777855).

28713625 is an frugal number, since it uses more digits than its factorization.

28713625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222 (or 123 counting only the distinct ones).

The product of its digits is 20160, while the sum is 34.

The square root of 28713625 is about 5358.5095875626. The cubic root of 28713625 is about 306.2170310198.

The spelling of 28713625 in words is "twenty-eight million, seven hundred thirteen thousand, six hundred twenty-five".