28787025 has 24 divisors (see below), whose sum is σ = 47754880. Its totient is φ = 15301440.

The previous prime is 28787023. The next prime is 28787029. The reversal of 28787025 is 52078782.

It is not a de Polignac number, because 28787025 - 2¹ = 28787023 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28787023) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 34311 + ... + 35139.

Almost surely, 2^28787025 is an apocalyptic number.

28787025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28787025 is a deficient number, since it is larger than the sum of its proper divisors (18967855).

28787025 is a wasteful number, since it uses less digits than its factorization.

28787025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1305 (or 1300 counting only the distinct ones).

The product of its (nonzero) digits is 62720, while the sum is 39.

The square root of 28787025 is about 5365.3541355627. The cubic root of 28787025 is about 306.4777342611.

The spelling of 28787025 in words is "twenty-eight million, seven hundred eighty-seven thousand, twenty-five".