28725870 has 16 divisors (see below), whose sum is σ = 68942160. Its totient is φ = 7660224.

The previous prime is 28725857. The next prime is 28725877. The reversal of 28725870 is 7852782.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28725877) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 478735 + ... + 478794.

It is an arithmetic number, because the mean of its divisors is an integer number (4308885).

Almost surely, 2^28725870 is an apocalyptic number.

28725870 is an abundant number, since it is smaller than the sum of its proper divisors (40216290).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28725870 is a wasteful number, since it uses less digits than its factorization.

28725870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 957539.

The product of its (nonzero) digits is 62720, while the sum is 39.

The square root of 28725870 is about 5359.6520409444. The cubic root of 28725870 is about 306.2605538498.

The spelling of 28725870 in words is "twenty-eight million, seven hundred twenty-five thousand, eight hundred seventy".