72658757538 has 80 divisors (see below), whose sum is σ = 167845104504. Its totient is φ = 23478024960.

The previous prime is 72658757459. The next prime is 72658757543. The reversal of 72658757538 is 83575785627.

72658757538 is a `hidden beast` number, since 7 + 2 + 6 + 58 + 7 + 575 + 3 + 8 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 13008999249 + 59649758289 = 114057^2 + 244233^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 1007956 + ... + 1077632.

Almost surely, 2^72658757538 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 72658757538, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (83922552252).

72658757538 is an abundant number, since it is smaller than the sum of its proper divisors (95186346966).

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

72658757538 is a wasteful number, since it uses less digits than its factorization.

72658757538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69889 (or 69880 counting only the distinct ones).

The product of its digits is 98784000, while the sum is 63.

The spelling of 72658757538 in words is "seventy-two billion, six hundred fifty-eight million, seven hundred fifty-seven thousand, five hundred thirty-eight".