77307904 has 28 divisors (see below), whose sum is σ = 154622754. Its totient is φ = 38649856.

The previous prime is 77307889. The next prime is 77307907. The reversal of 77307904 is 40970377.

It can be written as a sum of positive squares in only one way, i.e., 64000000 + 13307904 = 8000^2 + 3648^2 .

It is not an unprimeable number, because it can be changed into a prime (77307907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3474 + ... + 12910.

Almost surely, 2^77307904 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 77307904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (77311377).

77307904 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

77307904 is an frugal number, since it uses more digits than its factorization.

77307904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9463 (or 9439 counting only the distinct ones).

The product of its (nonzero) digits is 37044, while the sum is 37.

The square root of 77307904 is about 8792.4913420486. The cubic root of 77307904 is about 425.9983983129.

The spelling of 77307904 in words is "seventy-seven million, three hundred seven thousand, nine hundred four".