28860725 has 12 divisors (see below), whose sum is σ = 35999556. Its totient is φ = 22951680.

The previous prime is 28860691. The next prime is 28860731. The reversal of 28860725 is 52706882.

It can be written as a sum of positive squares in 6 ways, for example, as 1129969 + 27730756 = 1063^2 + 5266^2 .

It is not a de Polignac number, because 28860725 - 2⁶ = 28860661 is a prime.

It is a hoax number, since the sum of its digits (38) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 989 + ... + 7661.

It is an arithmetic number, because the mean of its divisors is an integer number (2999963).

Almost surely, 2^28860725 is an apocalyptic number.

28860725 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28860725 is a deficient number, since it is larger than the sum of its proper divisors (7138831).

28860725 is a wasteful number, since it uses less digits than its factorization.

28860725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6856 (or 6851 counting only the distinct ones).

The product of its (nonzero) digits is 53760, while the sum is 38.

The square root of 28860725 is about 5372.2178846357. The cubic root of 28860725 is about 306.7390575532.

The spelling of 28860725 in words is "twenty-eight million, eight hundred sixty thousand, seven hundred twenty-five".