72878983551 has 32 divisors (see below), whose sum is σ = 117803600640. Its totient is φ = 44161812000.

The previous prime is 72878983517. The next prime is 72878983553. The reversal of 72878983551 is 15538987827.

72878983551 is a `hidden beast` number, since 7 + 2 + 8 + 78 + 9 + 8 + 3 + 551 = 666.

It is not a de Polignac number, because 72878983551 - 2²⁵ = 72845429119 is a prime.

It is a super-2 number, since 2×72878983551² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72878983553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2196481 + ... + 2229413.

It is an arithmetic number, because the mean of its divisors is an integer number (3681362520).

Almost surely, 2^72878983551 is an apocalyptic number.

72878983551 is a deficient number, since it is larger than the sum of its proper divisors (44924617089).

72878983551 is a wasteful number, since it uses less digits than its factorization.

72878983551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40404 (or 40398 counting only the distinct ones).

The product of its digits is 33868800, while the sum is 63.

The spelling of 72878983551 in words is "seventy-two billion, eight hundred seventy-eight million, nine hundred eighty-three thousand, five hundred fifty-one".