68814921 has 16 divisors (see below), whose sum is σ = 107300864. Its totient is φ = 38407824.

The previous prime is 68814887. The next prime is 68814937. The reversal of 68814921 is 12941886.

It is not a de Polignac number, because 68814921 - 2¹⁴ = 68798537 is a prime.

It is a Smith number, since the sum of its digits (39) 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 self number, because there is not a number n which added to its sum of digits gives 68814921.

It is not an unprimeable number, because it can be changed into a prime (68814121) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 37201 + ... + 39006.

It is an arithmetic number, because the mean of its divisors is an integer number (6706304).

Almost surely, 2^68814921 is an apocalyptic number.

It is an amenable number.

68814921 is a deficient number, since it is larger than the sum of its proper divisors (38485943).

68814921 is a wasteful number, since it uses less digits than its factorization.

68814921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76260.

The product of its digits is 27648, while the sum is 39.

The square root of 68814921 is about 8295.4759357134. The cubic root of 68814921 is about 409.7895429902.

The spelling of 68814921 in words is "sixty-eight million, eight hundred fourteen thousand, nine hundred twenty-one".