28332975 has 48 divisors (see below), whose sum is σ = 52032384. Its totient is φ = 13488000.

The previous prime is 28332973. The next prime is 28332989. The reversal of 28332975 is 57923382.

It is not a de Polignac number, because 28332975 - 2¹ = 28332973 is a prime.

Its product of digits (90720) is a multiple of the sum of its prime factors (648).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28332973) 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, 50044 + ... + 50606.

It is an arithmetic number, because the mean of its divisors is an integer number (1084008).

Almost surely, 2^28332975 is an apocalyptic number.

28332975 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

28332975 is a deficient number, since it is larger than the sum of its proper divisors (23699409).

28332975 is a wasteful number, since it uses less digits than its factorization.

28332975 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 648 (or 643 counting only the distinct ones).

The product of its digits is 90720, while the sum is 39.

The square root of 28332975 is about 5322.8728145617. The cubic root of 28332975 is about 304.8578572631.

The spelling of 28332975 in words is "twenty-eight million, three hundred thirty-two thousand, nine hundred seventy-five".