688466990 has 16 divisors (see below), whose sum is σ = 1239550560. Its totient is φ = 275317920.

The previous prime is 688466983. The next prime is 688466993. The reversal of 688466990 is 99664886.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (688466993) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 57656 + ... + 68564.

It is an arithmetic number, because the mean of its divisors is an integer number (77471910).

Almost surely, 2^688466990 is an apocalyptic number.

688466990 is a deficient number, since it is larger than the sum of its proper divisors (551083570).

688466990 is a wasteful number, since it uses less digits than its factorization.

688466990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17227.

The product of its (nonzero) digits is 4478976, while the sum is 56.

The square root of 688466990 is about 26238.6545005646. The cubic root of 688466990 is about 883.0006853155. Note that the first 3 decimals are identical.

The spelling of 688466990 in words is "six hundred eighty-eight million, four hundred sixty-six thousand, nine hundred ninety".