79457805794640 has 2560 divisors, whose sum is σ = 328405380710400. Its totient is φ = 15772564684800.

The previous prime is 79457805794527. The next prime is 79457805794657. The reversal of 79457805794640 is 4649750875497.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 511 ways as a sum of consecutive naturals, for example, 161828524795 + ... + 161828525285.

It is an arithmetic number, because the mean of its divisors is an integer number (128283351840).

Almost surely, 2^{79457805794640} is an apocalyptic number.

79457805794640 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 79457805794640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (164202690355200).

79457805794640 is an abundant number, since it is smaller than the sum of its proper divisors (248947574915760).

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

79457805794640 is a wasteful number, since it uses less digits than its factorization.

79457805794640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 706 (or 686 counting only the distinct ones).

The product of its (nonzero) digits is 2133734400, while the sum is 75.

The spelling of 79457805794640 in words is "seventy-nine trillion, four hundred fifty-seven billion, eight hundred five million, seven hundred ninety-four thousand, six hundred forty".