681401252 has 36 divisors (see below), whose sum is σ = 1400145264. Its totient is φ = 289290960.

The previous prime is 681401239. The next prime is 681401257. The reversal of 681401252 is 252104186.

681401252 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (681401257) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4727 + ... + 37217.

It is an arithmetic number, because the mean of its divisors is an integer number (38892924).

Almost surely, 2^681401252 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 681401252, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (700072632).

681401252 is an abundant number, since it is smaller than the sum of its proper divisors (718744012).

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

681401252 is a wasteful number, since it uses less digits than its factorization.

681401252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32616 (or 32607 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 29.

The square root of 681401252 is about 26103.6635742955. The cubic root of 681401252 is about 879.9695461224.

The spelling of 681401252 in words is "six hundred eighty-one million, four hundred one thousand, two hundred fifty-two".