79665797400 has 384 divisors, whose sum is σ = 288945792000. Its totient is φ = 18149913600.

The previous prime is 79665797359. The next prime is 79665797411. The reversal of 79665797400 is 479756697.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 107221429 + ... + 107222171.

It is an arithmetic number, because the mean of its divisors is an integer number (752463000).

Almost surely, 2^79665797400 is an apocalyptic number.

79665797400 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 79665797400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (144472896000).

79665797400 is an abundant number, since it is smaller than the sum of its proper divisors (209279994600).

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

79665797400 is a wasteful number, since it uses less digits than its factorization.

79665797400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1304 (or 1281 counting only the distinct ones).

The product of its (nonzero) digits is 20003760, while the sum is 60.

The spelling of 79665797400 in words is "seventy-nine billion, six hundred sixty-five million, seven hundred ninety-seven thousand, four hundred".