28131572715 has 16 divisors (see below), whose sum is σ = 47658194208. Its totient is φ = 14120946176.

The previous prime is 28131572671. The next prime is 28131572717. The reversal of 28131572715 is 51727513182.

It is a cyclic number.

It is not a de Polignac number, because 28131572715 - 2¹⁹ = 28131048427 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28131572717) 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, 55159692 + ... + 55160201.

It is an arithmetic number, because the mean of its divisors is an integer number (2978637138).

Almost surely, 2^28131572715 is an apocalyptic number.

28131572715 is a deficient number, since it is larger than the sum of its proper divisors (19526621493).

28131572715 is a wasteful number, since it uses less digits than its factorization.

28131572715 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110319918.

The product of its digits is 117600, while the sum is 42.

The spelling of 28131572715 in words is "twenty-eight billion, one hundred thirty-one million, five hundred seventy-two thousand, seven hundred fifteen".