77700778900 has 72 divisors (see below), whose sum is σ = 169451029440. Its totient is φ = 30925789440.

The previous prime is 77700778871. The next prime is 77700778919. The reversal of 77700778900 is 987700777.

It is a super-2 number, since 2×77700778900² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 20624817 + ... + 20628583.

It is an arithmetic number, because the mean of its divisors is an integer number (2353486520).

Almost surely, 2^77700778900 is an apocalyptic number.

It is an amenable number.

77700778900 is an abundant number, since it is smaller than the sum of its proper divisors (91750250540).

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

77700778900 is a wasteful number, since it uses less digits than its factorization.

77700778900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4753 (or 4746 counting only the distinct ones).

The product of its (nonzero) digits is 1210104, while the sum is 52.

The spelling of 77700778900 in words is "seventy-seven billion, seven hundred million, seven hundred seventy-eight thousand, nine hundred".