68921858 has 4 divisors (see below), whose sum is σ = 103382790. Its totient is φ = 34460928.

The previous prime is 68921857. The next prime is 68921863. The reversal of 68921858 is 85812986.

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

It can be written as a sum of positive squares in only one way, i.e., 61669609 + 7252249 = 7853^2 + 2693^2 .

It is not an unprimeable number, because it can be changed into a prime (68921857) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 17230463 + ... + 17230466.

Almost surely, 2^68921858 is an apocalyptic number.

68921858 is a deficient number, since it is larger than the sum of its proper divisors (34460932).

68921858 is a wasteful number, since it uses less digits than its factorization.

68921858 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34460931.

The product of its digits is 276480, while the sum is 47.

The square root of 68921858 is about 8301.9189348006. The cubic root of 68921858 is about 410.0017013612.

The spelling of 68921858 in words is "sixty-eight million, nine hundred twenty-one thousand, eight hundred fifty-eight".