79802936640 has 840 divisors, whose sum is σ = 347704806240. Its totient is φ = 17275410432.

The previous prime is 79802936627. The next prime is 79802936641. The reversal of 79802936640 is 4663920897.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (840).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79802936641) by changing a digit.

It is a polite number, since it can be written in 119 ways as a sum of consecutive naturals, for example, 24129867 + ... + 24133173.

Almost surely, 2^79802936640 is an apocalyptic number.

79802936640 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 79802936640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (173852403120).

79802936640 is an abundant number, since it is smaller than the sum of its proper divisors (267901869600).

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

79802936640 is a wasteful number, since it uses less digits than its factorization.

79802936640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3369 (or 3343 counting only the distinct ones).

The product of its (nonzero) digits is 3919104, while the sum is 54.

The spelling of 79802936640 in words is "seventy-nine billion, eight hundred two million, nine hundred thirty-six thousand, six hundred forty".