78179696640 has 640 divisors, whose sum is σ = 288896105520. Its totient is φ = 20214448128.

The previous prime is 78179696591. The next prime is 78179696687. The reversal of 78179696640 is 4669697187.

It is a tau number, because it is divible by the number of its divisors (640).

It is a super-2 number, since 2×78179696640² (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 in 39 ways as a sum of consecutive naturals, for example, 570654652 + ... + 570654788.

Almost surely, 2^78179696640 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 78179696640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (144448052760).

78179696640 is an abundant number, since it is smaller than the sum of its proper divisors (210716408880).

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

78179696640 is an equidigital number, since it uses as much as digits as its factorization.

78179696640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 227 (or 190 counting only the distinct ones).

The product of its (nonzero) digits is 27433728, while the sum is 63.

The spelling of 78179696640 in words is "seventy-eight billion, one hundred seventy-nine million, six hundred ninety-six thousand, six hundred forty".