688990164 has 48 divisors (see below), whose sum is σ = 1622174400. Its totient is φ = 227598336.

The previous prime is 688990163. The next prime is 688990171. The reversal of 688990164 is 461099886.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (688990163) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 895572 + ... + 896340.

It is an arithmetic number, because the mean of its divisors is an integer number (33795300).

Almost surely, 2^688990164 is an apocalyptic number.

It is an amenable number.

688990164 is an abundant number, since it is smaller than the sum of its proper divisors (933184236).

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

688990164 is a wasteful number, since it uses less digits than its factorization.

688990164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1352 (or 1350 counting only the distinct ones).

The product of its (nonzero) digits is 746496, while the sum is 51.

The square root of 688990164 is about 26248.6221352665. The cubic root of 688990164 is about 883.2242961492.

The spelling of 688990164 in words is "six hundred eighty-eight million, nine hundred ninety thousand, one hundred sixty-four".