28179975 has 24 divisors (see below), whose sum is σ = 46743040. Its totient is φ = 14980320.

The previous prime is 28179973. The next prime is 28179979. The reversal of 28179975 is 57997182.

It is not a de Polignac number, because 28179975 - 2¹ = 28179973 is a prime.

It is a super-2 number, since 2×28179975² = 1588221982001250, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28179973) 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, 45216 + ... + 45834.

Almost surely, 2^28179975 is an apocalyptic number.

28179975 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

28179975 is a deficient number, since it is larger than the sum of its proper divisors (18563065).

28179975 is a wasteful number, since it uses less digits than its factorization.

28179975 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1239 (or 1234 counting only the distinct ones).

The product of its digits is 317520, while the sum is 48.

The square root of 28179975 is about 5308.4814212729. The cubic root of 28179975 is about 304.3081154415.

The spelling of 28179975 in words is "twenty-eight million, one hundred seventy-nine thousand, nine hundred seventy-five".