681780288 has 112 divisors (see below), whose sum is σ = 2090115200. Its totient is φ = 192098304.

The previous prime is 681780277. The next prime is 681780301. The reversal of 681780288 is 882087186.

It is a tau number, because it is divible by the number of its divisors (112).

It is a super-2 number, since 2×681780288² = 929648722210725888, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 94638 + ... + 101586.

Almost surely, 2^681780288 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 681780288, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1045057600).

681780288 is an abundant number, since it is smaller than the sum of its proper divisors (1408334912).

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

681780288 is a wasteful number, since it uses less digits than its factorization.

681780288 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7044 (or 7034 counting only the distinct ones).

The product of its (nonzero) digits is 344064, while the sum is 48.

The square root of 681780288 is about 26110.9227718976. The cubic root of 681780288 is about 880.1326797191.

The spelling of 681780288 in words is "six hundred eighty-one million, seven hundred eighty thousand, two hundred eighty-eight".