28718625 has 64 divisors (see below), whose sum is σ = 53044992. Its totient is φ = 13708800.

The previous prime is 28718621. The next prime is 28718639. The reversal of 28718625 is 52681782.

It is not a de Polignac number, because 28718625 - 2² = 28718621 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28718621) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 209557 + ... + 209693.

It is an arithmetic number, because the mean of its divisors is an integer number (828828).

Almost surely, 2^28718625 is an apocalyptic number.

28718625 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28718625 is a deficient number, since it is larger than the sum of its proper divisors (24326367).

28718625 is a wasteful number, since it uses less digits than its factorization.

28718625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 211 (or 201 counting only the distinct ones).

The product of its digits is 53760, while the sum is 39.

The square root of 28718625 is about 5358.9761148936. The cubic root of 28718625 is about 306.2348041884.

The spelling of 28718625 in words is "twenty-eight million, seven hundred eighteen thousand, six hundred twenty-five".