28972975 has 12 divisors (see below), whose sum is σ = 35995960. Its totient is φ = 23133600.

The previous prime is 28972969. The next prime is 28972991. The reversal of 28972975 is 57927982.

It is not a de Polignac number, because 28972975 - 2²³ = 20584367 is a prime.

It is a congruent 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, 19561 + ... + 20989.

Almost surely, 2^28972975 is an apocalyptic number.

28972975 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

28972975 is a deficient number, since it is larger than the sum of its proper divisors (7022985).

28972975 is a wasteful number, since it uses less digits than its factorization.

28972975 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2250 (or 2245 counting only the distinct ones).

The product of its digits is 635040, while the sum is 49.

The square root of 28972975 is about 5382.6550140242. The cubic root of 28972975 is about 307.1362168592.

The spelling of 28972975 in words is "twenty-eight million, nine hundred seventy-two thousand, nine hundred seventy-five".