688007966 has 4 divisors (see below), whose sum is σ = 1032011952. Its totient is φ = 344003982.

The previous prime is 688007953. The next prime is 688008001. The reversal of 688007966 is 669700886.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×688007966² = 946709922558914312, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 172001990 + ... + 172001993.

It is an arithmetic number, because the mean of its divisors is an integer number (258002988).

Almost surely, 2^688007966 is an apocalyptic number.

688007966 is a deficient number, since it is larger than the sum of its proper divisors (344003986).

688007966 is a wasteful number, since it uses less digits than its factorization.

688007966 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 344003985.

The product of its (nonzero) digits is 870912, while the sum is 50.

The square root of 688007966 is about 26229.9059472199. The cubic root of 688007966 is about 882.8043996423.

The spelling of 688007966 in words is "six hundred eighty-eight million, seven thousand, nine hundred sixty-six".