681323420 has 24 divisors (see below), whose sum is σ = 1432607904. Its totient is φ = 272181056.

The previous prime is 681323407. The next prime is 681323429. The reversal of 681323420 is 24323186.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681323429) 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, 5432 + ... + 37311.

It is an arithmetic number, because the mean of its divisors is an integer number (59691996).

Almost surely, 2^681323420 is an apocalyptic number.

It is an amenable number.

681323420 is an abundant number, since it is smaller than the sum of its proper divisors (751284484).

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

681323420 is a wasteful number, since it uses less digits than its factorization.

681323420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43549 (or 43547 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 29.

The square root of 681323420 is about 26102.1727065009. The cubic root of 681323420 is about 879.9360404616.

The spelling of 681323420 in words is "six hundred eighty-one million, three hundred twenty-three thousand, four hundred twenty".