79137968640 has 160 divisors (see below), whose sum is σ = 253719582336. Its totient is φ = 21042954240.

The previous prime is 79137968639. The next prime is 79137968647. The reversal of 79137968640 is 4686973197.

It is a tau number, because it is divible by the number of its divisors (160).

It is a Harshad number since it is a multiple of its sum of digits (60).

It is not an unprimeable number, because it can be changed into a prime (79137968647) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2696445 + ... + 2725635.

Almost surely, 2^79137968640 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 79137968640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (126859791168).

79137968640 is an abundant number, since it is smaller than the sum of its proper divisors (174581613696).

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

79137968640 is a wasteful number, since it uses less digits than its factorization.

79137968640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29570 (or 29554 counting only the distinct ones).

The product of its (nonzero) digits is 13716864, while the sum is 60.

The spelling of 79137968640 in words is "seventy-nine billion, one hundred thirty-seven million, nine hundred sixty-eight thousand, six hundred forty".