68782691 has 4 divisors (see below), whose sum is σ = 69139272. Its totient is φ = 68426112.

The previous prime is 68782657. The next prime is 68782699. The reversal of 68782691 is 19628786.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 68782691 - 2²⁶ = 1673827 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68782699) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 178001 + ... + 178386.

It is an arithmetic number, because the mean of its divisors is an integer number (17284818).

Almost surely, 2^68782691 is an apocalyptic number.

68782691 is a deficient number, since it is larger than the sum of its proper divisors (356581).

68782691 is a wasteful number, since it uses less digits than its factorization.

68782691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 356580.

The product of its digits is 290304, while the sum is 47.

The square root of 68782691 is about 8293.5330830714. The cubic root of 68782691 is about 409.7255569667.

The spelling of 68782691 in words is "sixty-eight million, seven hundred eighty-two thousand, six hundred ninety-one".