28990075 has 12 divisors (see below), whose sum is σ = 36825768. Its totient is φ = 22625600.

The previous prime is 28990061. The next prime is 28990133. The reversal of 28990075 is 57009982.

It is not a de Polignac number, because 28990075 - 2⁹ = 28989563 is a prime.

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, 13117 + ... + 15166.

It is an arithmetic number, because the mean of its divisors is an integer number (3068814).

Almost surely, 2^28990075 is an apocalyptic number.

28990075 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

28990075 is a deficient number, since it is larger than the sum of its proper divisors (7835693).

28990075 is a wasteful number, since it uses less digits than its factorization.

28990075 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28334 (or 28329 counting only the distinct ones).

The product of its (nonzero) digits is 45360, while the sum is 40.

The square root of 28990075 is about 5384.2432151603. The cubic root of 28990075 is about 307.1966294378.

The spelling of 28990075 in words is "twenty-eight million, nine hundred ninety thousand, seventy-five".