78975590778 has 96 divisors (see below), whose sum is σ = 201451536000. Its totient is φ = 21891558528.

The previous prime is 78975590777. The next prime is 78975590803. The reversal of 78975590778 is 87709557987.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (78975590777) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 758368 + ... + 856196.

It is an arithmetic number, because the mean of its divisors is an integer number (2098453500).

Almost surely, 2^78975590778 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78975590778, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (100725768000).

78975590778 is an abundant number, since it is smaller than the sum of its proper divisors (122475945222).

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

78975590778 is a wasteful number, since it uses less digits than its factorization.

78975590778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98036 (or 98033 counting only the distinct ones).

The product of its (nonzero) digits is 311169600, while the sum is 72.

The spelling of 78975590778 in words is "seventy-eight billion, nine hundred seventy-five million, five hundred ninety thousand, seven hundred seventy-eight".