28808775651 has 4 divisors (see below), whose sum is σ = 38411700872. Its totient is φ = 19205850432.

The previous prime is 28808775617. The next prime is 28808775727. The reversal of 28808775651 is 15657780882.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 28808775651 - 2¹⁰ = 28808774627 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28808775591 and 28808775600.

It is not an unprimeable number, because it can be changed into a prime (28808776651) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4801462606 + ... + 4801462611.

It is an arithmetic number, because the mean of its divisors is an integer number (9602925218).

Almost surely, 2^28808775651 is an apocalyptic number.

28808775651 is a deficient number, since it is larger than the sum of its proper divisors (9602925221).

28808775651 is an equidigital number, since it uses as much as digits as its factorization.

28808775651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9602925220.

The product of its (nonzero) digits is 7526400, while the sum is 57.

The spelling of 28808775651 in words is "twenty-eight billion, eight hundred eight million, seven hundred seventy-five thousand, six hundred fifty-one".