681659496 has 128 divisors (see below), whose sum is σ = 2233958400. Its totient is φ = 188464320.

The previous prime is 681659483. The next prime is 681659549. The reversal of 681659496 is 694956186.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 39601 + ... + 54143.

It is an arithmetic number, because the mean of its divisors is an integer number (17452800).

Almost surely, 2^681659496 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 681659496, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1116979200).

681659496 is an abundant number, since it is smaller than the sum of its proper divisors (1552298904).

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

681659496 is a wasteful number, since it uses less digits than its factorization.

681659496 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14596 (or 14586 counting only the distinct ones).

The product of its digits is 2799360, while the sum is 54.

The square root of 681659496 is about 26108.6096144548. The cubic root of 681659496 is about 880.0806985224.

The spelling of 681659496 in words is "six hundred eighty-one million, six hundred fifty-nine thousand, four hundred ninety-six".