28938725 has 12 divisors (see below), whose sum is σ = 35961984. Its totient is φ = 23100720.

The previous prime is 28938719. The next prime is 28938769. The reversal of 28938725 is 52783982.

It is not a de Polignac number, because 28938725 - 2¹⁶ = 28873189 is a prime.

It is a Duffinian number.

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, 14222 + ... + 16128.

It is an arithmetic number, because the mean of its divisors is an integer number (2996832).

Almost surely, 2^28938725 is an apocalyptic number.

28938725 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28938725 is a deficient number, since it is larger than the sum of its proper divisors (7023259).

28938725 is a wasteful number, since it uses less digits than its factorization.

28938725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2524 (or 2519 counting only the distinct ones).

The product of its digits is 241920, while the sum is 44.

The square root of 28938725 is about 5379.4725577885. The cubic root of 28938725 is about 307.0151435339.

The spelling of 28938725 in words is "twenty-eight million, nine hundred thirty-eight thousand, seven hundred twenty-five".