688100994 has 40 divisors (see below), whose sum is σ = 1762123968. Its totient is φ = 196599960.

The previous prime is 688100989. The next prime is 688100999. The reversal of 688100994 is 499001886.

It is an interprime number because it is at equal distance from previous prime (688100989) and next prime (688100999).

It is not an unprimeable number, because it can be changed into a prime (688100999) by changing a digit.

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 19 ways as a sum of consecutive naturals, for example, 302262 + ... + 304529.

Almost surely, 2^688100994 is an apocalyptic number.

688100994 is an abundant number, since it is smaller than the sum of its proper divisors (1074022974).

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

688100994 is a wasteful number, since it uses less digits than its factorization.

688100994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 606812 (or 606803 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 45.

The square root of 688100994 is about 26231.6792066387. The cubic root of 688100994 is about 882.8441868882.

The spelling of 688100994 in words is "six hundred eighty-eight million, one hundred thousand, nine hundred ninety-four".