688643246 has 8 divisors (see below), whose sum is σ = 1035226560. Its totient is φ = 343567728.

The previous prime is 688643243. The next prime is 688643303. The reversal of 688643246 is 642346886.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×688643246² = 948459040522833032, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 688643246.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (688643243) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 375806 + ... + 377633.

It is an arithmetic number, because the mean of its divisors is an integer number (129403320).

Almost surely, 2^688643246 is an apocalyptic number.

688643246 is a deficient number, since it is larger than the sum of its proper divisors (346583314).

688643246 is a wasteful number, since it uses less digits than its factorization.

688643246 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 753898.

The product of its digits is 1327104, while the sum is 47.

The square root of 688643246 is about 26242.0129944332. The cubic root of 688643246 is about 883.0760318905.

The spelling of 688643246 in words is "six hundred eighty-eight million, six hundred forty-three thousand, two hundred forty-six".