28315961855 has 32 divisors (see below), whose sum is σ = 36150997248. Its totient is φ = 21217996800.

The previous prime is 28315961809. The next prime is 28315961857. The reversal of 28315961855 is 55816951382.

It is a de Polignac number, because none of the positive numbers 2^k-28315961855 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28315961797 and 28315961806.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28315961857) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 20503265 + ... + 20504645.

It is an arithmetic number, because the mean of its divisors is an integer number (1129718664).

Almost surely, 2^28315961855 is an apocalyptic number.

28315961855 is a deficient number, since it is larger than the sum of its proper divisors (7835035393).

28315961855 is a wasteful number, since it uses less digits than its factorization.

28315961855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2387.

The product of its digits is 2592000, while the sum is 53.

The spelling of 28315961855 in words is "twenty-eight billion, three hundred fifteen million, nine hundred sixty-one thousand, eight hundred fifty-five".