77622647872 has 112 divisors (see below), whose sum is σ = 192208343040. Its totient is φ = 30216153600.

The previous prime is 77622647789. The next prime is 77622647897. The reversal of 77622647872 is 27874622677.

It is a tau number, because it is divible by the number of its divisors (112).

It is a super-2 number, since 2×77622647872² (a number of 23 digits) contains 22 as substring.

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, 6198097 + ... + 6210607.

It is an arithmetic number, because the mean of its divisors is an integer number (1716145920).

Almost surely, 2^77622647872 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 77622647872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (96104171520).

77622647872 is an abundant number, since it is smaller than the sum of its proper divisors (114585695168).

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

77622647872 is a wasteful number, since it uses less digits than its factorization.

77622647872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13800 (or 13790 counting only the distinct ones).

The product of its digits is 22127616, while the sum is 58.

The spelling of 77622647872 in words is "seventy-seven billion, six hundred twenty-two million, six hundred forty-seven thousand, eight hundred seventy-two".