688968850 has 12 divisors (see below), whose sum is σ = 1281482154. Its totient is φ = 275587520.

The previous prime is 688968799. The next prime is 688968851. The reversal of 688968850 is 58869886.

It can be written as a sum of positive squares in 3 ways, for example, as 598927729 + 90041121 = 24473^2 + 9489^2 .

It is not an unprimeable number, because it can be changed into a prime (688968851) 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 5 ways as a sum of consecutive naturals, for example, 6889639 + ... + 6889738.

Almost surely, 2^688968850 is an apocalyptic number.

688968850 is a deficient number, since it is larger than the sum of its proper divisors (592513304).

688968850 is a wasteful number, since it uses less digits than its factorization.

688968850 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13779389 (or 13779384 counting only the distinct ones).

The product of its (nonzero) digits is 6635520, while the sum is 58.

The square root of 688968850 is about 26248.2161298630. The cubic root of 688968850 is about 883.2151885026.

The spelling of 688968850 in words is "six hundred eighty-eight million, nine hundred sixty-eight thousand, eight hundred fifty".