681698272 has 24 divisors (see below), whose sum is σ = 1364844600. Its totient is φ = 335071104.

The previous prime is 681698263. The next prime is 681698287. The reversal of 681698272 is 272896186.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 178647 + ... + 182422.

It is an arithmetic number, because the mean of its divisors is an integer number (56868525).

Almost surely, 2^681698272 is an apocalyptic number.

It is an amenable number.

681698272 is an abundant number, since it is smaller than the sum of its proper divisors (683146328).

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

681698272 is a wasteful number, since it uses less digits than its factorization.

681698272 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 361138 (or 361130 counting only the distinct ones).

The product of its digits is 580608, while the sum is 49.

The square root of 681698272 is about 26109.3521941851. The cubic root of 681698272 is about 880.0973859165.

The spelling of 681698272 in words is "six hundred eighty-one million, six hundred ninety-eight thousand, two hundred seventy-two".