681159630 has 16 divisors (see below), whose sum is σ = 1634783184. Its totient is φ = 181642560.

The previous prime is 681159629. The next prime is 681159649. The reversal of 681159630 is 36951186.

It is a plaindrome in base 16.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11352631 + ... + 11352690.

It is an arithmetic number, because the mean of its divisors is an integer number (102173949).

Almost surely, 2^681159630 is an apocalyptic number.

681159630 is an abundant number, since it is smaller than the sum of its proper divisors (953623554).

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

681159630 is a wasteful number, since it uses less digits than its factorization.

681159630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22705331.

The product of its (nonzero) digits is 38880, while the sum is 39.

The square root of 681159630 is about 26099.0350396332. The cubic root of 681159630 is about 879.8655226671.

The spelling of 681159630 in words is "six hundred eighty-one million, one hundred fifty-nine thousand, six hundred thirty".