28565857477 has 16 divisors (see below), whose sum is σ = 30322393920. Its totient is φ = 26835494400.

The previous prime is 28565857459. The next prime is 28565857493. The reversal of 28565857477 is 77475856582.

It is not a de Polignac number, because 28565857477 - 2¹⁵ = 28565824709 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 (28565855477) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1202202 + ... + 1225732.

It is an arithmetic number, because the mean of its divisors is an integer number (1895149620).

Almost surely, 2^28565857477 is an apocalyptic number.

It is an amenable number.

28565857477 is a deficient number, since it is larger than the sum of its proper divisors (1756536443).

28565857477 is a wasteful number, since it uses less digits than its factorization.

28565857477 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24084.

The product of its digits is 131712000, while the sum is 64.

The spelling of 28565857477 in words is "twenty-eight billion, five hundred sixty-five million, eight hundred fifty-seven thousand, four hundred seventy-seven".