28397925 has 24 divisors (see below), whose sum is σ = 52169280. Its totient is φ = 15145200.

The previous prime is 28397923. The next prime is 28397933. The reversal of 28397925 is 52979382.

It is not a de Polignac number, because 28397925 - 2¹ = 28397923 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28397923) 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, 20361 + ... + 21710.

It is an arithmetic number, because the mean of its divisors is an integer number (2173720).

Almost surely, 2^28397925 is an apocalyptic number.

28397925 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28397925 is a deficient number, since it is larger than the sum of its proper divisors (23771355).

28397925 is a wasteful number, since it uses less digits than its factorization.

28397925 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42090 (or 42079 counting only the distinct ones).

The product of its digits is 272160, while the sum is 45.

The square root of 28397925 is about 5328.9703508276. The cubic root of 28397925 is about 305.0906297006.

The spelling of 28397925 in words is "twenty-eight million, three hundred ninety-seven thousand, nine hundred twenty-five".