28774427508 has 36 divisors (see below), whose sum is σ = 73005774660. Its totient is φ = 9555816576.

The previous prime is 28774427497. The next prime is 28774427533. The reversal of 28774427508 is 80572447782.

28774427508 is a `hidden beast` number, since 2 + 8 + 77 + 44 + 27 + 508 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 2875318884 + 25899108624 = 53622^2 + 160932^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a hoax number, since the sum of its digits (54) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1475985 + ... + 1495352.

It is an arithmetic number, because the mean of its divisors is an integer number (2027938185).

Almost surely, 2^28774427508 is an apocalyptic number.

It is an amenable number.

28774427508 is an abundant number, since it is smaller than the sum of its proper divisors (44231347152).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28774427508 is a wasteful number, since it uses less digits than its factorization.

28774427508 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2971616 (or 2971611 counting only the distinct ones).

The product of its (nonzero) digits is 7024640, while the sum is 54.

The spelling of 28774427508 in words is "twenty-eight billion, seven hundred seventy-four million, four hundred twenty-seven thousand, five hundred eight".