68211823 has 4 divisors (see below), whose sum is σ = 69875568. Its totient is φ = 66548080.

The previous prime is 68211809. The next prime is 68211883. The reversal of 68211823 is 32811286.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32811286 = 2 ⋅16405643.

It is a cyclic number.

It is not a de Polignac number, because 68211823 - 2¹³ = 68203631 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax 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 (68211883) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 831811 + ... + 831892.

It is an arithmetic number, because the mean of its divisors is an integer number (17468892).

Almost surely, 2^68211823 is an apocalyptic number.

68211823 is a deficient number, since it is larger than the sum of its proper divisors (1663745).

68211823 is a wasteful number, since it uses less digits than its factorization.

68211823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1663744.

The product of its digits is 4608, while the sum is 31.

The square root of 68211823 is about 8259.0449205704. The cubic root of 68211823 is about 408.5888887385.

The spelling of 68211823 in words is "sixty-eight million, two hundred eleven thousand, eight hundred twenty-three".