72437867138 has 32 divisors (see below), whose sum is σ = 134478610560. Its totient is φ = 28496632320.

The previous prime is 72437867129. The next prime is 72437867147. The reversal of 72437867138 is 83176873427.

It is an interprime number because it is at equal distance from previous prime (72437867129) and next prime (72437867147).

It is a super-2 number, since 2×72437867138² (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 15 ways as a sum of consecutive naturals, for example, 1079183 + ... + 1144338.

It is an arithmetic number, because the mean of its divisors is an integer number (4202456580).

Almost surely, 2^72437867138 is an apocalyptic number.

72437867138 is a deficient number, since it is larger than the sum of its proper divisors (62040743422).

72437867138 is a wasteful number, since it uses less digits than its factorization.

72437867138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2223722.

The product of its digits is 9483264, while the sum is 56.

The spelling of 72437867138 in words is "seventy-two billion, four hundred thirty-seven million, eight hundred sixty-seven thousand, one hundred thirty-eight".