678790764 has 18 divisors (see below), whose sum is σ = 1715832300. Its totient is φ = 226263576.

The previous prime is 678790747. The next prime is 678790799. The reversal of 678790764 is 467097876.

It is a tau number, because it is divible by the number of its divisors (18).

It is a self number, because there is not a number n which added to its sum of digits gives 678790764.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 9427614 + ... + 9427685.

Almost surely, 2^678790764 is an apocalyptic number.

It is an amenable number.

678790764 is an abundant number, since it is smaller than the sum of its proper divisors (1037041536).

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

678790764 is a wasteful number, since it uses less digits than its factorization.

678790764 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18855309 (or 18855304 counting only the distinct ones).

The product of its (nonzero) digits is 3556224, while the sum is 54.

The square root of 678790764 is about 26053.6132618875. The cubic root of 678790764 is about 878.8443697800.

The spelling of 678790764 in words is "six hundred seventy-eight million, seven hundred ninety thousand, seven hundred sixty-four".