681949368 has 192 divisors, whose sum is σ = 2074800000. Its totient is φ = 209112192.

The previous prime is 681949363. The next prime is 681949381. The reversal of 681949368 is 863949186.

It is a Harshad number since it is a multiple of its sum of digits (54).

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

Its product of digits (2239488) is a multiple of the sum of its prime factors (576).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681949363) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1366383 + ... + 1366881.

It is an arithmetic number, because the mean of its divisors is an integer number (10806250).

Almost surely, 2^681949368 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 681949368, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1037400000).

681949368 is an abundant number, since it is smaller than the sum of its proper divisors (1392850632).

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

681949368 is a wasteful number, since it uses less digits than its factorization.

681949368 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 576 (or 560 counting only the distinct ones).

The product of its digits is 2239488, while the sum is 54.

The square root of 681949368 is about 26114.1602966666. The cubic root of 681949368 is about 880.2054306899.

The spelling of 681949368 in words is "six hundred eighty-one million, nine hundred forty-nine thousand, three hundred sixty-eight".