28478156755689 has 12 divisors (see below), whose sum is σ = 42658638103536. Its totient is φ = 18985437836964.

The previous prime is 28478156755649. The next prime is 28478156755703. The reversal of 28478156755689 is 98655765187482.

28478156755689 is a `hidden beast` number, since 2 + 8 + 4 + 7 + 8 + 1 + 56 + 7 + 556 + 8 + 9 = 666.

It is not a de Polignac number, because 28478156755689 - 2¹⁵ = 28478156722921 is a prime.

It is a super-2 number, since 2×28478156755689² (a number of 28 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (81).

It is not an unprimeable number, because it can be changed into a prime (28478156755649) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 58597030119 + ... + 58597030604.

It is an arithmetic number, because the mean of its divisors is an integer number (3554886508628).

Almost surely, 2^{28478156755689} is an apocalyptic number.

It is an amenable number.

28478156755689 is a deficient number, since it is larger than the sum of its proper divisors (14180481347847).

28478156755689 is an equidigital number, since it uses as much as digits as its factorization.

28478156755689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117194060738 (or 117194060726 counting only the distinct ones).

The product of its digits is 8128512000, while the sum is 81.

The spelling of 28478156755689 in words is "twenty-eight trillion, four hundred seventy-eight billion, one hundred fifty-six million, seven hundred fifty-five thousand, six hundred eighty-nine".