77909090884 has 27 divisors (see below), whose sum is σ = 138472697727. Its totient is φ = 38354712264.

The previous prime is 77909090881. The next prime is 77909090893. The reversal of 77909090884 is 48809090977.

The square root of 77909090884 is 279122.

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

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77909090881) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 37401307 + ... + 37403389.

Almost surely, 2^77909090884 is an apocalyptic number.

77909090884 is the 279122-nd square number.

It is an amenable number.

77909090884 is a deficient number, since it is larger than the sum of its proper divisors (60563606843).

77909090884 is an frugal number, since it uses more digits than its factorization.

77909090884 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4304 (or 2152 counting only the distinct ones).

The product of its (nonzero) digits is 9144576, while the sum is 61.

The spelling of 77909090884 in words is "seventy-seven billion, nine hundred nine million, ninety thousand, eight hundred eighty-four".