28742275 has 12 divisors (see below), whose sum is σ = 36470632. Its totient is φ = 22458240.

The previous prime is 28742267. The next prime is 28742293. The reversal of 28742275 is 57224782.

It is not a de Polignac number, because 28742275 - 2³ = 28742267 is a prime.

It is a super-2 number, since 2×28742275² = 1652236744351250, which contains 22 as substring.

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12294 + ... + 14443.

Almost surely, 2^28742275 is an apocalyptic number.

28742275 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

28742275 is a deficient number, since it is larger than the sum of its proper divisors (7728357).

28742275 is a wasteful number, since it uses less digits than its factorization.

28742275 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26790 (or 26785 counting only the distinct ones).

The product of its digits is 62720, while the sum is 37.

The square root of 28742275 is about 5361.1822390215. The cubic root of 28742275 is about 306.3188433321.

The spelling of 28742275 in words is "twenty-eight million, seven hundred forty-two thousand, two hundred seventy-five".