23278531815 has 256 divisors, whose sum is σ = 55594598400. Its totient is φ = 8948620800.

The previous prime is 23278531807. The next prime is 23278531819. The reversal of 23278531815 is 51813587232.

23278531815 is a `hidden beast` number, since 2 + 32 + 7 + 8 + 531 + 81 + 5 = 666.

It is not a de Polignac number, because 23278531815 - 2³ = 23278531807 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23278531819) by changing a digit.

It is a polite number, since it can be written in 255 ways as a sum of consecutive naturals, for example, 8491345 + ... + 8494085.

It is an arithmetic number, because the mean of its divisors is an integer number (217166400).

Almost surely, 2^23278531815 is an apocalyptic number.

23278531815 is an abundant number, since it is smaller than the sum of its proper divisors (32316066585).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

23278531815 is a wasteful number, since it uses less digits than its factorization.

23278531815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2835 (or 2829 counting only the distinct ones).

The product of its digits is 403200, while the sum is 45.

The spelling of 23278531815 in words is "twenty-three billion, two hundred seventy-eight million, five hundred thirty-one thousand, eight hundred fifteen".