78799569921408 has 1024 divisors, whose sum is σ = 260050452480000. Its totient is φ = 21094951772160.

The previous prime is 78799569921379. The next prime is 78799569921427. The reversal of 78799569921408 is 80412996599787.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (84).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 33689425903 + ... + 33689428241.

It is an arithmetic number, because the mean of its divisors is an integer number (253955520000).

Almost surely, 2^{78799569921408} 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 78799569921408, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (130025226240000).

78799569921408 is an abundant number, since it is smaller than the sum of its proper divisors (181250882558592).

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

78799569921408 is a wasteful number, since it uses less digits than its factorization.

78799569921408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2668 (or 2642 counting only the distinct ones).

The product of its (nonzero) digits is 4938071040, while the sum is 84.

The spelling of 78799569921408 in words is "seventy-eight trillion, seven hundred ninety-nine billion, five hundred sixty-nine million, nine hundred twenty-one thousand, four hundred eight".