688925081 has 8 divisors (see below), whose sum is σ = 744744000. Its totient is φ = 633509712.

The previous prime is 688925077. The next prime is 688925087. The reversal of 688925081 is 180529886.

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

It is a cyclic number.

It is not a de Polignac number, because 688925081 - 2² = 688925077 is a prime.

It is a super-2 number, since 2×688925081² = 949235534461713122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (688925087) 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 7 ways as a sum of consecutive naturals, for example, 97331 + ... + 104168.

It is an arithmetic number, because the mean of its divisors is an integer number (93093000).

Almost surely, 2^688925081 is an apocalyptic number.

It is an amenable number.

688925081 is a deficient number, since it is larger than the sum of its proper divisors (55818919).

688925081 is a wasteful number, since it uses less digits than its factorization.

688925081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 201775.

The product of its (nonzero) digits is 276480, while the sum is 47.

The square root of 688925081 is about 26247.3823647235. The cubic root of 688925081 is about 883.1964850618.

The spelling of 688925081 in words is "six hundred eighty-eight million, nine hundred twenty-five thousand, eighty-one".