681269632 has 64 divisors (see below), whose sum is σ = 1391981760. Its totient is φ = 332001280.

The previous prime is 681269599. The next prime is 681269639. The reversal of 681269632 is 236962186.

It is a tau number, because it is divible by the number of its divisors (64).

It is a super-2 number, since 2×681269632² = 928256622970830848, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681269639) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1580457 + ... + 1580887.

It is an arithmetic number, because the mean of its divisors is an integer number (21749715).

Almost surely, 2^681269632 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 681269632, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (695990880).

681269632 is an abundant number, since it is smaller than the sum of its proper divisors (710712128).

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

681269632 is a wasteful number, since it uses less digits than its factorization.

681269632 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 731 (or 719 counting only the distinct ones).

The product of its digits is 186624, while the sum is 43.

The square root of 681269632 is about 26101.1423504796. The cubic root of 681269632 is about 879.9128839382.

The spelling of 681269632 in words is "six hundred eighty-one million, two hundred sixty-nine thousand, six hundred thirty-two".