72731501044 has 6 divisors (see below), whose sum is σ = 127280126834. Its totient is φ = 36365750520.

The previous prime is 72731501021. The next prime is 72731501057. The reversal of 72731501044 is 44010513727.

It can be written as a sum of positive squares in only one way, i.e., 39684624100 + 33046876944 = 199210^2 + 181788^2 .

It is a super-2 number, since 2×72731501044² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9091437627 + ... + 9091437634.

Almost surely, 2^72731501044 is an apocalyptic number.

It is an amenable number.

72731501044 is a deficient number, since it is larger than the sum of its proper divisors (54548625790).

72731501044 is a wasteful number, since it uses less digits than its factorization.

72731501044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18182875265 (or 18182875263 counting only the distinct ones).

The product of its (nonzero) digits is 23520, while the sum is 34.

The spelling of 72731501044 in words is "seventy-two billion, seven hundred thirty-one million, five hundred one thousand, forty-four".