681375510 has 64 divisors (see below), whose sum is σ = 1829304000. Its totient is φ = 180470016.

The previous prime is 681375509. The next prime is 681375517. The reversal of 681375510 is 15573186.

681375510 is a `hidden beast` number, since 6 + 8 + 137 + 5 + 510 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681375517) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 31762 + ... + 48698.

It is an arithmetic number, because the mean of its divisors is an integer number (28582875).

Almost surely, 2^681375510 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 681375510, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (914652000).

681375510 is an abundant number, since it is smaller than the sum of its proper divisors (1147928490).

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

681375510 is a wasteful number, since it uses less digits than its factorization.

681375510 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17102 (or 17096 counting only the distinct ones).

The product of its (nonzero) digits is 25200, while the sum is 36.

The square root of 681375510 is about 26103.1704970871. The cubic root of 681375510 is about 879.9584648096.

The spelling of 681375510 in words is "six hundred eighty-one million, three hundred seventy-five thousand, five hundred ten".