72381837840 has 80 divisors (see below), whose sum is σ = 241643992128. Its totient is φ = 17817067008.

The previous prime is 72381837823. The next prime is 72381837851. The reversal of 72381837840 is 4873818327.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (80).

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, 11596534 + ... + 11602773.

Almost surely, 2^72381837840 is an apocalyptic number.

It is an amenable number.

72381837840 is an abundant number, since it is smaller than the sum of its proper divisors (169262154288).

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

72381837840 is a wasteful number, since it uses less digits than its factorization.

72381837840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23199336 (or 23199330 counting only the distinct ones).

The product of its (nonzero) digits is 1806336, while the sum is 51.

The spelling of 72381837840 in words is "seventy-two billion, three hundred eighty-one million, eight hundred thirty-seven thousand, eight hundred forty".