681626 has 8 divisors (see below), whose sum is σ = 1115424. Its totient is φ = 309820.

The previous prime is 681623. The next prime is 681631. The reversal of 681626 is 626186.

681626 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a super-2 number, since 2×681626² = 929228007752, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (681623) 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, 15470 + ... + 15513.

It is an arithmetic number, because the mean of its divisors is an integer number (139428).

2⁶⁸¹⁶²⁶ is an apocalyptic number.

681626 is a deficient number, since it is larger than the sum of its proper divisors (433798).

681626 is a wasteful number, since it uses less digits than its factorization.

681626 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30996.

The product of its digits is 3456, while the sum is 29.

The square root of 681626 is about 825.6064437733. The cubic root of 681626 is about 88.0066282886.

The spelling of 681626 in words is "six hundred eighty-one thousand, six hundred twenty-six".