681533980 has 24 divisors (see below), whose sum is σ = 1466130960. Its totient is φ = 265964160.

The previous prime is 681533929. The next prime is 681533987. The reversal of 681533980 is 89335186.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681533987) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 414750 + ... + 416389.

It is an arithmetic number, because the mean of its divisors is an integer number (61088790).

Almost surely, 2^681533980 is an apocalyptic number.

It is an amenable number.

681533980 is an abundant number, since it is smaller than the sum of its proper divisors (784596980).

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

681533980 is a wasteful number, since it uses less digits than its factorization.

681533980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 831189 (or 831187 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 43.

The square root of 681533980 is about 26106.2057756389. The cubic root of 681533980 is about 880.0266779102.

The spelling of 681533980 in words is "six hundred eighty-one million, five hundred thirty-three thousand, nine hundred eighty".