681909190 has 32 divisors (see below), whose sum is σ = 1272672000. Its totient is φ = 262754688.

The previous prime is 681909187. The next prime is 681909191. The reversal of 681909190 is 91909186.

It is a super-2 number, since 2×681909190² = 930000286812912200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681909191) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 136456 + ... + 141364.

It is an arithmetic number, because the mean of its divisors is an integer number (39771000).

Almost surely, 2^681909190 is an apocalyptic number.

681909190 is a deficient number, since it is larger than the sum of its proper divisors (590762810).

681909190 is a wasteful number, since it uses less digits than its factorization.

681909190 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5424.

The product of its (nonzero) digits is 34992, while the sum is 43.

The square root of 681909190 is about 26113.3910092121. The cubic root of 681909190 is about 880.1881441727.

The spelling of 681909190 in words is "six hundred eighty-one million, nine hundred nine thousand, one hundred ninety".