688448994 has 16 divisors (see below), whose sum is σ = 1377401760. Its totient is φ = 229399040.

The previous prime is 688448947. The next prime is 688449007. The reversal of 688448994 is 499844886.

It is a super-2 number, since 2×688448994² = 947924034679224072, which contains 22 as substring.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 1887 + ... + 37154.

It is an arithmetic number, because the mean of its divisors is an integer number (86087610).

Almost surely, 2^688448994 is an apocalyptic number.

688448994 is an abundant number, since it is smaller than the sum of its proper divisors (688952766).

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

688448994 is a wasteful number, since it uses less digits than its factorization.

688448994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41985.

The product of its digits is 15925248, while the sum is 60.

The square root of 688448994 is about 26238.3115691540. The cubic root of 688448994 is about 882.9929915945.

The spelling of 688448994 in words is "six hundred eighty-eight million, four hundred forty-eight thousand, nine hundred ninety-four".