68040891 has 40 divisors (see below), whose sum is σ = 106158624. Its totient is φ = 43390080.

The previous prime is 68040871. The next prime is 68040901. The reversal of 68040891 is 19804086.

It is a happy number.

It is not a de Polignac number, because 68040891 - 2⁵ = 68040859 is a prime.

It is a super-3 number, since 3×68040891³ (a number of 24 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (68040811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 218626 + ... + 218936.

Almost surely, 2^68040891 is an apocalyptic number.

68040891 is a deficient number, since it is larger than the sum of its proper divisors (38117733).

68040891 is a wasteful number, since it uses less digits than its factorization.

68040891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 433 (or 424 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 36.

The square root of 68040891 is about 8248.6902596715. The cubic root of 68040891 is about 408.2473089735.

The spelling of 68040891 in words is "sixty-eight million, forty thousand, eight hundred ninety-one".