681549268 has 12 divisors (see below), whose sum is σ = 1193298400. Its totient is φ = 340606872.

The previous prime is 681549263. The next prime is 681549283. The reversal of 681549268 is 862945186.

It is a super-2 number, since 2×681549268² = 929018809422671648, which contains 22 as substring.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681549263) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32568 + ... + 49231.

Almost surely, 2^681549268 is an apocalyptic number.

It is an amenable number.

681549268 is a deficient number, since it is larger than the sum of its proper divisors (511749132).

681549268 is a wasteful number, since it uses less digits than its factorization.

681549268 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83886 (or 83884 counting only the distinct ones).

The product of its digits is 829440, while the sum is 49.

The square root of 681549268 is about 26106.4985779403. The cubic root of 681549268 is about 880.0332580406.

The spelling of 681549268 in words is "six hundred eighty-one million, five hundred forty-nine thousand, two hundred sixty-eight".