28398975 has 48 divisors (see below), whose sum is σ = 53032320. Its totient is φ = 13283200.

The previous prime is 28398973. The next prime is 28398989. The reversal of 28398975 is 57989382.

It is not a de Polignac number, because 28398975 - 2¹ = 28398973 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28398973) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 23332 + ... + 24518.

It is an arithmetic number, because the mean of its divisors is an integer number (1104840).

Almost surely, 2^28398975 is an apocalyptic number.

28398975 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

28398975 is a deficient number, since it is larger than the sum of its proper divisors (24633345).

28398975 is a wasteful number, since it uses less digits than its factorization.

28398975 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1240 (or 1235 counting only the distinct ones).

The product of its digits is 1088640, while the sum is 51.

The square root of 28398975 is about 5329.0688680106. The cubic root of 28398975 is about 305.0943898487.

The spelling of 28398975 in words is "twenty-eight million, three hundred ninety-eight thousand, nine hundred seventy-five".