681468144 has 40 divisors (see below), whose sum is σ = 2011954560. Its totient is φ = 194705088.

The previous prime is 681468121. The next prime is 681468167. The reversal of 681468144 is 441864186.

It is an interprime number because it is at equal distance from previous prime (681468121) and next prime (681468167).

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 681468096 and 681468105.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1013754 + ... + 1014425.

It is an arithmetic number, because the mean of its divisors is an integer number (50298864).

Almost surely, 2^681468144 is an apocalyptic number.

It is an amenable number.

681468144 is an abundant number, since it is smaller than the sum of its proper divisors (1330486416).

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

681468144 is a wasteful number, since it uses less digits than its factorization.

681468144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2028197 (or 2028191 counting only the distinct ones).

The product of its digits is 147456, while the sum is 42.

The square root of 681468144 is about 26104.9448189419. The cubic root of 681468144 is about 879.9983402173.

The spelling of 681468144 in words is "six hundred eighty-one million, four hundred sixty-eight thousand, one hundred forty-four".