78837582778 has 32 divisors (see below), whose sum is σ = 125318793600. Its totient is φ = 37092936384.

The previous prime is 78837582749. The next prime is 78837582799. The reversal of 78837582778 is 87728573887.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10384608 + ... + 10392196.

It is an arithmetic number, because the mean of its divisors is an integer number (3916212300).

Almost surely, 2^78837582778 is an apocalyptic number.

78837582778 is a deficient number, since it is larger than the sum of its proper divisors (46481210822).

78837582778 is a wasteful number, since it uses less digits than its factorization.

78837582778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9414.

The product of its digits is 295034880, while the sum is 70.

The spelling of 78837582778 in words is "seventy-eight billion, eight hundred thirty-seven million, five hundred eighty-two thousand, seven hundred seventy-eight".