681238964 has 36 divisors (see below), whose sum is σ = 1390076100. Its totient is φ = 291271680.

The previous prime is 681238963. The next prime is 681238967. The reversal of 681238964 is 469832186.

It can be written as a sum of positive squares in 2 ways, for example, as 271986064 + 409252900 = 16492^2 + 20230^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681238963) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 84134 + ... + 91874.

It is an arithmetic number, because the mean of its divisors is an integer number (38613225).

Almost surely, 2^681238964 is an apocalyptic number.

It is an amenable number.

681238964 is an abundant number, since it is smaller than the sum of its proper divisors (708837136).

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

681238964 is a wasteful number, since it uses less digits than its factorization.

681238964 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8208 (or 8199 counting only the distinct ones).

The product of its digits is 497664, while the sum is 47.

The square root of 681238964 is about 26100.5548600025. The cubic root of 681238964 is about 879.8996803684.

The spelling of 681238964 in words is "six hundred eighty-one million, two hundred thirty-eight thousand, nine hundred sixty-four".