28973975 has 12 divisors (see below), whose sum is σ = 36024480. Its totient is φ = 23116800.

The previous prime is 28973957. The next prime is 28973981. The reversal of 28973975 is 57937982.

It is a happy number.

It is not a de Polignac number, because 28973975 - 2²⁴ = 12196759 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, 9431 + ... + 12119.

It is an arithmetic number, because the mean of its divisors is an integer number (3002040).

Almost surely, 2^28973975 is an apocalyptic number.

28973975 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

28973975 is a deficient number, since it is larger than the sum of its proper divisors (7050505).

28973975 is a wasteful number, since it uses less digits than its factorization.

28973975 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3130 (or 3125 counting only the distinct ones).

The product of its digits is 952560, while the sum is 50.

The square root of 28973975 is about 5382.7479041843. The cubic root of 28973975 is about 307.1397504128.

The spelling of 28973975 in words is "twenty-eight million, nine hundred seventy-three thousand, nine hundred seventy-five".