77078318226 has 64 divisors (see below), whose sum is σ = 190082678016. Its totient is φ = 20290694400.

The previous prime is 77078318173. The next prime is 77078318237. The reversal of 77078318226 is 62281387077.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 164916 + ... + 425856.

It is an arithmetic number, because the mean of its divisors is an integer number (2970041844).

Almost surely, 2^77078318226 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 77078318226, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (95041339008).

77078318226 is an abundant number, since it is smaller than the sum of its proper divisors (113004359790).

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

77078318226 is a wasteful number, since it uses less digits than its factorization.

77078318226 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 261507.

The product of its (nonzero) digits is 1580544, while the sum is 51.

The spelling of 77078318226 in words is "seventy-seven billion, seventy-eight million, three hundred eighteen thousand, two hundred twenty-six".