681000000 has 196 divisors, whose sum is σ = 2262158544. Its totient is φ = 180800000.

The previous prime is 680999989. The next prime is 681000013. The reversal of 681000000 is 186.

It is a super-2 number, since 2×681000000² = 927522000000000000, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is an unprimeable number.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 2999887 + ... + 3000113.

Almost surely, 2^681000000 is an apocalyptic number.

681000000 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 681000000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1131079272).

681000000 is an abundant number, since it is smaller than the sum of its proper divisors (1581158544).

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

681000000 is an frugal number, since it uses more digits than its factorization.

681000000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 272 (or 237 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 15.

The square root of 681000000 is about 26095.9767013998. The cubic root of 681000000 is about 879.7967850319.

Adding to 681000000 its reverse (186), we get a palindrome (681000186).

The spelling of 681000000 in words is "six hundred eighty-one million", and thus it is an aban number.