681626004 has 24 divisors (see below), whose sum is σ = 1620470880. Its totient is φ = 222921504.

The previous prime is 681625993. The next prime is 681626009. The reversal of 681626004 is 400626186.

It is a happy number.

It is a super-2 number, since 2×681626004² = 929228018658016032, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681626009) 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, 535234 + ... + 536505.

It is an arithmetic number, because the mean of its divisors is an integer number (67519620).

Almost surely, 2^681626004 is an apocalyptic number.

It is an amenable number.

681626004 is an abundant number, since it is smaller than the sum of its proper divisors (938844876).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

681626004 is a wasteful number, since it uses less digits than its factorization.

681626004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1071799 (or 1071797 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 33.

The square root of 681626004 is about 26107.9682089587. The cubic root of 681626004 is about 880.0662846076.

The spelling of 681626004 in words is "six hundred eighty-one million, six hundred twenty-six thousand, four".