688721114 has 8 divisors (see below), whose sum is σ = 1052573940. Its totient is φ = 337863136.

The previous prime is 688721093. The next prime is 688721123. The reversal of 688721114 is 411127886.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 672520489 + 16200625 = 25933^2 + 4025^2 .

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

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 3 ways as a sum of consecutive naturals, for example, 3248579 + ... + 3248790.

Almost surely, 2^688721114 is an apocalyptic number.

688721114 is a deficient number, since it is larger than the sum of its proper divisors (363852826).

688721114 is a wasteful number, since it uses less digits than its factorization.

688721114 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6497424.

The product of its digits is 21504, while the sum is 38.

The square root of 688721114 is about 26243.4966039208. The cubic root of 688721114 is about 883.1093151003.

The spelling of 688721114 in words is "six hundred eighty-eight million, seven hundred twenty-one thousand, one hundred fourteen".