72724377725 has 6 divisors (see below), whose sum is σ = 90178228410. Its totient is φ = 58179502160.

The previous prime is 72724377721. The next prime is 72724377731. The reversal of 72724377725 is 52777342727.

It can be written as a sum of positive squares in 3 ways, for example, as 4522966009 + 68201411716 = 67253^2 + 261154^2 .

It is not a de Polignac number, because 72724377725 - 2² = 72724377721 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72724377721) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1454487530 + ... + 1454487579.

It is an arithmetic number, because the mean of its divisors is an integer number (15029704735).

Almost surely, 2^72724377725 is an apocalyptic number.

It is an amenable number.

72724377725 is a deficient number, since it is larger than the sum of its proper divisors (17453850685).

72724377725 is a wasteful number, since it uses less digits than its factorization.

72724377725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2908975119 (or 2908975114 counting only the distinct ones).

The product of its digits is 8067360, while the sum is 53.

The spelling of 72724377725 in words is "seventy-two billion, seven hundred twenty-four million, three hundred seventy-seven thousand, seven hundred twenty-five".