77780904 has 32 divisors (see below), whose sum is σ = 194685120. Its totient is φ = 25895936.

The previous prime is 77780897. The next prime is 77780909. The reversal of 77780904 is 40908777.

It is not an unprimeable number, because it can be changed into a prime (77780909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27877 + ... + 30539.

It is an arithmetic number, because the mean of its divisors is an integer number (6083910).

Almost surely, 2^77780904 is an apocalyptic number.

It is an amenable number.

77780904 is an abundant number, since it is smaller than the sum of its proper divisors (116904216).

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

77780904 is a wasteful number, since it uses less digits than its factorization.

77780904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3889 (or 3885 counting only the distinct ones).

The product of its (nonzero) digits is 98784, while the sum is 42.

The square root of 77780904 is about 8819.3482752412. The cubic root of 77780904 is about 426.8654406931.

The spelling of 77780904 in words is "seventy-seven million, seven hundred eighty thousand, nine hundred four".