28520807 has 8 divisors (see below), whose sum is σ = 32700576. Its totient is φ = 24367392.

The previous prime is 28520773. The next prime is 28520809. The reversal of 28520807 is 70802582.

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

It is not a de Polignac number, because 28520807 - 2⁸ = 28520551 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 (28520809) 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, 4208 + ... + 8645.

It is an arithmetic number, because the mean of its divisors is an integer number (4087572).

Almost surely, 2^28520807 is an apocalyptic number.

28520807 is a deficient number, since it is larger than the sum of its proper divisors (4179769).

28520807 is a wasteful number, since it uses less digits than its factorization.

28520807 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13177.

The product of its (nonzero) digits is 8960, while the sum is 32.

The square root of 28520807 is about 5340.4875245618. The cubic root of 28520807 is about 305.5300538398.

The spelling of 28520807 in words is "twenty-eight million, five hundred twenty thousand, eight hundred seven".