28131645063 has 32 divisors (see below), whose sum is σ = 38376115200. Its totient is φ = 18326094080.

The previous prime is 28131645019. The next prime is 28131645071. The reversal of 28131645063 is 36054613182.

It is not a de Polignac number, because 28131645063 - 2⁹ = 28131644551 is a prime.

It is a super-2 number, since 2×28131645063² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28131640063) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 23579995 + ... + 23581187.

It is an arithmetic number, because the mean of its divisors is an integer number (1199253600).

Almost surely, 2^28131645063 is an apocalyptic number.

28131645063 is a deficient number, since it is larger than the sum of its proper divisors (10244470137).

28131645063 is a wasteful number, since it uses less digits than its factorization.

28131645063 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2159.

The product of its (nonzero) digits is 103680, while the sum is 39.

The spelling of 28131645063 in words is "twenty-eight billion, one hundred thirty-one million, six hundred forty-five thousand, sixty-three".