688664070 has 48 divisors (see below), whose sum is σ = 1848292992. Its totient is φ = 177719040.

The previous prime is 688664059. The next prime is 688664083. The reversal of 688664070 is 70466886.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 120627 + ... + 126206.

It is an arithmetic number, because the mean of its divisors is an integer number (38506104).

Almost surely, 2^688664070 is an apocalyptic number.

688664070 is an abundant number, since it is smaller than the sum of its proper divisors (1159628922).

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

688664070 is a wasteful number, since it uses less digits than its factorization.

688664070 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 246877 (or 246874 counting only the distinct ones).

The product of its (nonzero) digits is 387072, while the sum is 45.

The square root of 688664070 is about 26242.4097597763. The cubic root of 688664070 is about 883.0849329628.

The spelling of 688664070 in words is "six hundred eighty-eight million, six hundred sixty-four thousand, seventy".