72440867818 has 24 divisors (see below), whose sum is σ = 120378134016. Its totient is φ = 32668380360.

The previous prime is 72440867803. The next prime is 72440867833. The reversal of 72440867818 is 81876804427.

It is an interprime number because it is at equal distance from previous prime (72440867803) and next prime (72440867833).

It is a super-2 number, since 2×72440867818² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1147780 + ... + 1209247.

It is an arithmetic number, because the mean of its divisors is an integer number (5015755584).

Almost surely, 2^72440867818 is an apocalyptic number.

72440867818 is a deficient number, since it is larger than the sum of its proper divisors (47937266198).

72440867818 is a wasteful number, since it uses less digits than its factorization.

72440867818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2357178 (or 2357167 counting only the distinct ones).

The product of its (nonzero) digits is 4816896, while the sum is 55.

The spelling of 72440867818 in words is "seventy-two billion, four hundred forty million, eight hundred sixty-seven thousand, eight hundred eighteen".