28774632613 has 4 divisors (see below), whose sum is σ = 28792652140. Its totient is φ = 28756613088.

The previous prime is 28774632581. The next prime is 28774632617. The reversal of 28774632613 is 31623647782.

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

It can be written as a sum of positive squares in 2 ways, for example, as 16646676484 + 12127956129 = 129022^2 + 110127^2 .

It is a cyclic number.

It is not a de Polignac number, because 28774632613 - 2⁵ = 28774632581 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 (28774632617) 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, 9007368 + ... + 9010561.

It is an arithmetic number, because the mean of its divisors is an integer number (7198163035).

Almost surely, 2^28774632613 is an apocalyptic number.

It is an amenable number.

28774632613 is a deficient number, since it is larger than the sum of its proper divisors (18019527).

28774632613 is a wasteful number, since it uses less digits than its factorization.

28774632613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18019526.

The product of its digits is 2032128, while the sum is 49.

The spelling of 28774632613 in words is "twenty-eight billion, seven hundred seventy-four million, six hundred thirty-two thousand, six hundred thirteen".