28920075 has 24 divisors (see below), whose sum is σ = 48496896. Its totient is φ = 15204000.

The previous prime is 28920049. The next prime is 28920079. The reversal of 28920075 is 57002982.

It is not a de Polignac number, because 28920075 - 2⁸ = 28919819 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28920079) 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, 2610 + ... + 8040.

It is an arithmetic number, because the mean of its divisors is an integer number (2020704).

Almost surely, 2^28920075 is an apocalyptic number.

28920075 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

28920075 is a deficient number, since it is larger than the sum of its proper divisors (19576821).

28920075 is a wasteful number, since it uses less digits than its factorization.

28920075 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5515 (or 5510 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 33.

The square root of 28920075 is about 5377.7388370950. The cubic root of 28920075 is about 306.9491758395.

The spelling of 28920075 in words is "twenty-eight million, nine hundred twenty thousand, seventy-five".