28876725 has 18 divisors (see below), whose sum is σ = 51721826. Its totient is φ = 15400800.

The previous prime is 28876711. The next prime is 28876733. The reversal of 28876725 is 52767882.

It can be written as a sum of positive squares in 3 ways, for example, as 6380676 + 22496049 = 2526^2 + 4743^2 .

It is not a de Polignac number, because 28876725 - 2⁴ = 28876709 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

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 17 ways as a sum of consecutive naturals, for example, 63946 + ... + 64395.

Almost surely, 2^28876725 is an apocalyptic number.

28876725 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28876725 is a deficient number, since it is larger than the sum of its proper divisors (22845101).

28876725 is a wasteful number, since it uses less digits than its factorization.

28876725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128357 (or 128349 counting only the distinct ones).

The product of its digits is 376320, while the sum is 45.

The square root of 28876725 is about 5373.7068211803. The cubic root of 28876725 is about 306.7957310920.

The spelling of 28876725 in words is "twenty-eight million, eight hundred seventy-six thousand, seven hundred twenty-five".