28056124865 has 8 divisors (see below), whose sum is σ = 34577278440. Its totient is φ = 21838280832.

The previous prime is 28056124847. The next prime is 28056124927. The reversal of 28056124865 is 56842165082.

It can be written as a sum of positive squares in 4 ways, for example, as 983700496 + 27072424369 = 31364^2 + 164537^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28056124865 - 2¹² = 28056120769 is a prime.

It is a super-2 number, since 2×28056124865² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 75827180 + ... + 75827549.

It is an arithmetic number, because the mean of its divisors is an integer number (4322159805).

Almost surely, 2^28056124865 is an apocalyptic number.

It is an amenable number.

28056124865 is a deficient number, since it is larger than the sum of its proper divisors (6521153575).

28056124865 is a wasteful number, since it uses less digits than its factorization.

28056124865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151654771.

The product of its (nonzero) digits is 921600, while the sum is 47.

The spelling of 28056124865 in words is "twenty-eight billion, fifty-six million, one hundred twenty-four thousand, eight hundred sixty-five".