28740725 has 24 divisors (see below), whose sum is σ = 38664192. Its totient is φ = 21067200.

The previous prime is 28740721. The next prime is 28740737. The reversal of 28740725 is 52704782.

It is not a de Polignac number, because 28740725 - 2² = 28740721 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28740721) 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, 61844 + ... + 62306.

It is an arithmetic number, because the mean of its divisors is an integer number (1611008).

Almost surely, 2^28740725 is an apocalyptic number.

28740725 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28740725 is a deficient number, since it is larger than the sum of its proper divisors (9923467).

28740725 is a wasteful number, since it uses less digits than its factorization.

28740725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 677 (or 672 counting only the distinct ones).

The product of its (nonzero) digits is 31360, while the sum is 35.

The square root of 28740725 is about 5361.0376794050. The cubic root of 28740725 is about 306.3133368932.

The spelling of 28740725 in words is "twenty-eight million, seven hundred forty thousand, seven hundred twenty-five".