68021923 has 4 divisors (see below), whose sum is σ = 68883040. Its totient is φ = 67160808.

The previous prime is 68021917. The next prime is 68021963. The reversal of 68021923 is 32912086.

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 68021923 - 2¹³ = 68013731 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68021963) 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, 430440 + ... + 430597.

It is an arithmetic number, because the mean of its divisors is an integer number (17220760).

Almost surely, 2^68021923 is an apocalyptic number.

68021923 is a deficient number, since it is larger than the sum of its proper divisors (861117).

68021923 is an equidigital number, since it uses as much as digits as its factorization.

68021923 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 861116.

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 68021923 is about 8247.5404212407. The cubic root of 68021923 is about 408.2093692654.

The spelling of 68021923 in words is "sixty-eight million, twenty-one thousand, nine hundred twenty-three".