688677801 has 32 divisors (see below), whose sum is σ = 1074144000. Its totient is φ = 392313600.

The previous prime is 688677797. The next prime is 688677811. The reversal of 688677801 is 108776886.

It is not a de Polignac number, because 688677801 - 2² = 688677797 is a prime.

It is a super-2 number, since 2×688677801² = 948554227180391202, which contains 22 as substring.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (688677811) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 411795 + ... + 413463.

It is an arithmetic number, because the mean of its divisors is an integer number (33567000).

Almost surely, 2^688677801 is an apocalyptic number.

It is an amenable number.

688677801 is a deficient number, since it is larger than the sum of its proper divisors (385466199).

688677801 is a wasteful number, since it uses less digits than its factorization.

688677801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2094 (or 2080 counting only the distinct ones).

The product of its (nonzero) digits is 903168, while the sum is 51.

The square root of 688677801 is about 26242.6713769768. The cubic root of 688677801 is about 883.0908020840.

The spelling of 688677801 in words is "six hundred eighty-eight million, six hundred seventy-seven thousand, eight hundred one".