68782143 has 4 divisors (see below), whose sum is σ = 91709528. Its totient is φ = 45854760.

The previous prime is 68782139. The next prime is 68782151. The reversal of 68782143 is 34128786.

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

It is not a de Polignac number, because 68782143 - 2² = 68782139 is a prime.

It is the 8294-th Hogben number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68782193) by changing a digit.

It is a nontrivial repunit in base 8293.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11463688 + ... + 11463693.

It is an arithmetic number, because the mean of its divisors is an integer number (22927382).

Almost surely, 2^68782143 is an apocalyptic number.

68782143 is a deficient number, since it is larger than the sum of its proper divisors (22927385).

68782143 is a wasteful number, since it uses less digits than its factorization.

68782143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22927384.

The product of its digits is 64512, while the sum is 39.

The square root of 68782143 is about 8293.5000452161. The cubic root of 68782143 is about 409.7244688529.

The spelling of 68782143 in words is "sixty-eight million, seven hundred eighty-two thousand, one hundred forty-three".