72291886826 has 4 divisors (see below), whose sum is σ = 108437830242. Its totient is φ = 36145943412.

The previous prime is 72291886813. The next prime is 72291886841. The reversal of 72291886826 is 62868819227.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 70728870601 + 1563016225 = 265949^2 + 39535^2 .

It is a super-2 number, since 2×72291886826² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18072971705 + ... + 18072971708.

Almost surely, 2^72291886826 is an apocalyptic number.

72291886826 is a deficient number, since it is larger than the sum of its proper divisors (36145943416).

72291886826 is a wasteful number, since it uses less digits than its factorization.

72291886826 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36145943415.

The product of its digits is 9289728, while the sum is 59.

The spelling of 72291886826 in words is "seventy-two billion, two hundred ninety-one million, eight hundred eighty-six thousand, eight hundred twenty-six".