77778734922 has 32 divisors (see below), whose sum is σ = 197533296000. Its totient is φ = 22222495584.

The previous prime is 77778734903. The next prime is 77778734933. The reversal of 77778734922 is 22943787777.

77778734922 is a `hidden beast` number, since 7 + 7 + 7 + 78 + 73 + 492 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a self number, because there is not a number n which added to its sum of digits gives 77778734922.

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, 102881547 + ... + 102882302.

It is an arithmetic number, because the mean of its divisors is an integer number (6172915500).

Almost surely, 2^77778734922 is an apocalyptic number.

77778734922 is an abundant number, since it is smaller than the sum of its proper divisors (119754561078).

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

77778734922 is a wasteful number, since it uses less digits than its factorization.

77778734922 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 205763867 (or 205763861 counting only the distinct ones).

The product of its digits is 58084992, while the sum is 63.

The spelling of 77778734922 in words is "seventy-seven billion, seven hundred seventy-eight million, seven hundred thirty-four thousand, nine hundred twenty-two".