77794778694 has 32 divisors (see below), whose sum is σ = 157304759040. Its totient is φ = 25646598432.

The previous prime is 77794778687. The next prime is 77794778729. The reversal of 77794778694 is 49687749777.

It is a congruent 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, 249007 + ... + 466469.

It is an arithmetic number, because the mean of its divisors is an integer number (4915773720).

Almost surely, 2^77794778694 is an apocalyptic number.

77794778694 is an abundant number, since it is smaller than the sum of its proper divisors (79509980346).

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

77794778694 is a wasteful number, since it uses less digits than its factorization.

77794778694 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 218124.

The product of its digits is 1045529856, while the sum is 75.

The spelling of 77794778694 in words is "seventy-seven billion, seven hundred ninety-four million, seven hundred seventy-eight thousand, six hundred ninety-four".