43680681 has 16 divisors (see below), whose sum is σ = 70595520. Its totient is φ = 26472960.

The previous prime is 43680671. The next prime is 43680727. The reversal of 43680681 is 18608634.

It is a happy number.

It is not a de Polignac number, because 43680681 - 2⁵ = 43680649 is a prime.

It is a super-2 number, since 2×43680681² = 3816003785247522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (43680661) 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, 73240 + ... + 73833.

It is an arithmetic number, because the mean of its divisors is an integer number (4412220).

Almost surely, 2^43680681 is an apocalyptic number.

It is an amenable number.

43680681 is a deficient number, since it is larger than the sum of its proper divisors (26914839).

43680681 is a wasteful number, since it uses less digits than its factorization.

43680681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147093 (or 147087 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 36.

The square root of 43680681 is about 6609.1361765362. The cubic root of 43680681 is about 352.1787385335.

The spelling of 43680681 in words is "forty-three million, six hundred eighty thousand, six hundred eighty-one".