77772938884 has 9 divisors (see below), whose sum is σ = 136103619127. Its totient is φ = 38886190564.

The previous prime is 77772938879. The next prime is 77772938959. The reversal of 77772938884 is 48883927777.

The square root of 77772938884 is 278878.

It is a perfect power (a square), and thus also a powerful number.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 488037 + ... + 627475.

Almost surely, 2^77772938884 is an apocalyptic number.

77772938884 is the 278878-th square number.

It is an amenable number.

77772938884 is a deficient number, since it is larger than the sum of its proper divisors (58330680243).

77772938884 is an frugal number, since it uses more digits than its factorization.

77772938884 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 278882 (or 139441 counting only the distinct ones).

The product of its digits is 265531392, while the sum is 70.

The spelling of 77772938884 in words is "seventy-seven billion, seven hundred seventy-two million, nine hundred thirty-eight thousand, eight hundred eighty-four".