28392975 has 72 divisors (see below), whose sum is σ = 58090032. Its totient is φ = 13132800.

The previous prime is 28392919. The next prime is 28392977. The reversal of 28392975 is 57929382.

It is not a de Polignac number, because 28392975 - 2¹¹ = 28390927 is a prime.

It is a super-2 number, since 2×28392975² = 1612322058701250, which contains 22 as substring.

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

It is a self number, because there is not a number n which added to its sum of digits gives 28392975.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28392977) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 49440 + ... + 50010.

It is an arithmetic number, because the mean of its divisors is an integer number (806806).

Almost surely, 2^28392975 is an apocalyptic number.

28392975 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

28392975 is an abundant number, since it is smaller than the sum of its proper divisors (29697057).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28392975 is a wasteful number, since it uses less digits than its factorization.

28392975 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 617 (or 609 counting only the distinct ones).

The product of its digits is 272160, while the sum is 45.

The square root of 28392975 is about 5328.5058881454. The cubic root of 28392975 is about 305.0729020394.

The spelling of 28392975 in words is "twenty-eight million, three hundred ninety-two thousand, nine hundred seventy-five".