681244830 has 160 divisors (see below), whose sum is σ = 2111161536. Its totient is φ = 154400256.

The previous prime is 681244819. The next prime is 681244831. The reversal of 681244830 is 38442186.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681244831) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 776352 + ... + 777228.

Almost surely, 2^681244830 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 681244830, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1055580768).

681244830 is an abundant number, since it is smaller than the sum of its proper divisors (1429916706).

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

681244830 is a wasteful number, since it uses less digits than its factorization.

681244830 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1040 (or 1031 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 36.

The square root of 681244830 is about 26100.6672328506. The cubic root of 681244830 is about 879.9022059026.

The spelling of 681244830 in words is "six hundred eighty-one million, two hundred forty-four thousand, eight hundred thirty".