688965390 has 48 divisors (see below), whose sum is σ = 1849101696. Its totient is φ = 177796800.

The previous prime is 688965373. The next prime is 688965427. The reversal of 688965390 is 93569886.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 120681 + ... + 126260.

It is an arithmetic number, because the mean of its divisors is an integer number (38522952).

Almost surely, 2^688965390 is an apocalyptic number.

688965390 is an abundant number, since it is smaller than the sum of its proper divisors (1160136306).

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

688965390 is a wasteful number, since it uses less digits than its factorization.

688965390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 246985 (or 246982 counting only the distinct ones).

The product of its (nonzero) digits is 2799360, while the sum is 54.

The square root of 688965390 is about 26248.1502205394. The cubic root of 688965390 is about 883.2137099986.

The spelling of 688965390 in words is "six hundred eighty-eight million, nine hundred sixty-five thousand, three hundred ninety".