681407280 has 120 divisors (see below), whose sum is σ = 2362289280. Its totient is φ = 175841280.

The previous prime is 681407267. The next prime is 681407299. The reversal of 681407280 is 82704186.

It is a tau number, because it is divible by the number of its divisors (120).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7056 + ... + 37584.

It is an arithmetic number, because the mean of its divisors is an integer number (19685744).

Almost surely, 2^681407280 is an apocalyptic number.

681407280 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 681407280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1181144640).

681407280 is an abundant number, since it is smaller than the sum of its proper divisors (1680882000).

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

681407280 is a wasteful number, since it uses less digits than its factorization.

681407280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30579 (or 30570 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 36.

The square root of 681407280 is about 26103.7790367602. The cubic root of 681407280 is about 879.9721409913.

The spelling of 681407280 in words is "six hundred eighty-one million, four hundred seven thousand, two hundred eighty".