77879194956 has 96 divisors (see below), whose sum is σ = 206992558080. Its totient is φ = 25310356992.

The previous prime is 77879194933. The next prime is 77879194957. The reversal of 77879194956 is 65949197877.

It is not an unprimeable number, because it can be changed into a prime (77879194957) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1305820 + ... + 1364156.

It is an arithmetic number, because the mean of its divisors is an integer number (2156172480).

Almost surely, 2^77879194956 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 77879194956, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (103496279040).

77879194956 is an abundant number, since it is smaller than the sum of its proper divisors (129113363124).

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

77879194956 is a wasteful number, since it uses less digits than its factorization.

77879194956 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58660 (or 58652 counting only the distinct ones).

The product of its digits is 240045120, while the sum is 72.

The spelling of 77879194956 in words is "seventy-seven billion, eight hundred seventy-nine million, one hundred ninety-four thousand, nine hundred fifty-six".