28124715956 has 12 divisors (see below), whose sum is σ = 49224421092. Its totient is φ = 14060595648.

The previous prime is 28124715863. The next prime is 28124715961. The reversal of 28124715956 is 65951742182.

It can be written as a sum of positive squares in 2 ways, for example, as 25351008400 + 2773707556 = 159220^2 + 52666^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 404345 + ... + 468768.

It is an arithmetic number, because the mean of its divisors is an integer number (4102035091).

Almost surely, 2^28124715956 is an apocalyptic number.

It is an amenable number.

28124715956 is a deficient number, since it is larger than the sum of its proper divisors (21099705136).

28124715956 is a wasteful number, since it uses less digits than its factorization.

28124715956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 881170 (or 881168 counting only the distinct ones).

The product of its digits is 1209600, while the sum is 50.

The spelling of 28124715956 in words is "twenty-eight billion, one hundred twenty-four million, seven hundred fifteen thousand, nine hundred fifty-six".