77806904 has 48 divisors (see below), whose sum is σ = 172094400. Its totient is φ = 32876928.

The previous prime is 77806891. The next prime is 77806961. The reversal of 77806904 is 40960877.

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 27257 + ... + 29975.

It is an arithmetic number, because the mean of its divisors is an integer number (3585300).

Almost surely, 2^77806904 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 77806904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (86047200).

77806904 is an abundant number, since it is smaller than the sum of its proper divisors (94287496).

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

77806904 is a wasteful number, since it uses less digits than its factorization.

77806904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2812 (or 2801 counting only the distinct ones).

The product of its (nonzero) digits is 84672, while the sum is 41.

The square root of 77806904 is about 8820.8221839010. The cubic root of 77806904 is about 426.9129984889.

The spelling of 77806904 in words is "seventy-seven million, eight hundred six thousand, nine hundred four".