681333490 has 16 divisors (see below), whose sum is σ = 1256313240. Its totient is φ = 265886080.

The previous prime is 681333473. The next prime is 681333493. The reversal of 681333490 is 94333186.

It can be written as a sum of positive squares in 4 ways, for example, as 387656721 + 293676769 = 19689^2 + 17137^2 .

It is not an unprimeable number, because it can be changed into a prime (681333493) 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, 830485 + ... + 831304.

Almost surely, 2^681333490 is an apocalyptic number.

681333490 is a deficient number, since it is larger than the sum of its proper divisors (574979750).

681333490 is a wasteful number, since it uses less digits than its factorization.

681333490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1661837.

The product of its (nonzero) digits is 46656, while the sum is 37.

The square root of 681333490 is about 26102.3656016078. The cubic root of 681333490 is about 879.9403756090.

The spelling of 681333490 in words is "six hundred eighty-one million, three hundred thirty-three thousand, four hundred ninety".