681501438 has 40 divisors (see below), whose sum is σ = 1532681832. Its totient is φ = 226332144.

The previous prime is 681501433. The next prime is 681501461. The reversal of 681501438 is 834105186.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681501433) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 37281 + ... + 52467.

Almost surely, 2^681501438 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 681501438, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (766340916).

681501438 is an abundant number, since it is smaller than the sum of its proper divisors (851180394).

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

681501438 is a wasteful number, since it uses less digits than its factorization.

681501438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15478 (or 15469 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 36.

The square root of 681501438 is about 26105.5825064295. The cubic root of 681501438 is about 880.0126711330.

The spelling of 681501438 in words is "six hundred eighty-one million, five hundred one thousand, four hundred thirty-eight".