28506878451 has 48 divisors (see below), whose sum is σ = 45320786784. Its totient is φ = 17844240384.

The previous prime is 28506878441. The next prime is 28506878453. The reversal of 28506878451 is 15487860582.

28506878451 is a `hidden beast` number, since 2 + 8 + 506 + 8 + 7 + 84 + 51 = 666.

It is not a de Polignac number, because 28506878451 - 2¹⁴ = 28506862067 is a prime.

It is a super-3 number, since 3×28506878451³ (a number of 32 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (28506878453) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1780755 + ... + 1796691.

It is an arithmetic number, because the mean of its divisors is an integer number (944183058).

Almost surely, 2^28506878451 is an apocalyptic number.

28506878451 is a deficient number, since it is larger than the sum of its proper divisors (16813908333).

28506878451 is a wasteful number, since it uses less digits than its factorization.

28506878451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16402 (or 16390 counting only the distinct ones).

The product of its (nonzero) digits is 4300800, while the sum is 54.

The spelling of 28506878451 in words is "twenty-eight billion, five hundred six million, eight hundred seventy-eight thousand, four hundred fifty-one".