681698674 has 32 divisors (see below), whose sum is σ = 1101761136. Its totient is φ = 315187200.

The previous prime is 681698653. The next prime is 681698683. The reversal of 681698674 is 476896186.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 651525625 + 30173049 = 25525^2 + 5493^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1133974 + ... + 1134574.

Almost surely, 2^681698674 is an apocalyptic number.

681698674 is a deficient number, since it is larger than the sum of its proper divisors (420062462).

681698674 is a wasteful number, since it uses less digits than its factorization.

681698674 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1150.

The product of its digits is 3483648, while the sum is 55.

The square root of 681698674 is about 26109.3598925749. The cubic root of 681698674 is about 880.0975589154.

The spelling of 681698674 in words is "six hundred eighty-one million, six hundred ninety-eight thousand, six hundred seventy-four".