28624521 has 8 divisors (see below), whose sum is σ = 38190784. Its totient is φ = 19070640.

The previous prime is 28624517. The next prime is 28624523. The reversal of 28624521 is 12542682.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 28624521 - 2² = 28624517 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28624523) 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, 7116 + ... + 10386.

It is an arithmetic number, because the mean of its divisors is an integer number (4773848).

Almost surely, 2^28624521 is an apocalyptic number.

It is an amenable number.

28624521 is a deficient number, since it is larger than the sum of its proper divisors (9566263).

28624521 is a wasteful number, since it uses less digits than its factorization.

28624521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6191.

The product of its digits is 7680, while the sum is 30.

The square root of 28624521 is about 5350.1888751707. The cubic root of 28624521 is about 305.8999523412.

The spelling of 28624521 in words is "twenty-eight million, six hundred twenty-four thousand, five hundred twenty-one".