28787075 has 6 divisors (see below), whose sum is σ = 35696004. Its totient is φ = 23029640.

The previous prime is 28787051. The next prime is 28787117. The reversal of 28787075 is 57078782.

It is not a de Polignac number, because 28787075 - 2⁸ = 28786819 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 575717 + ... + 575766.

It is an arithmetic number, because the mean of its divisors is an integer number (5949334).

Almost surely, 2^28787075 is an apocalyptic number.

28787075 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

28787075 is a deficient number, since it is larger than the sum of its proper divisors (6908929).

28787075 is a wasteful number, since it uses less digits than its factorization.

28787075 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1151493 (or 1151488 counting only the distinct ones).

The product of its (nonzero) digits is 219520, while the sum is 44.

The square root of 28787075 is about 5365.3587950854. The cubic root of 28787075 is about 306.4779117007.

The spelling of 28787075 in words is "twenty-eight million, seven hundred eighty-seven thousand, seventy-five".