68021245 has 4 divisors (see below), whose sum is σ = 81625500. Its totient is φ = 54416992.

The previous prime is 68021243. The next prime is 68021257. The reversal of 68021245 is 54212086.

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

It can be written as a sum of positive squares in 2 ways, for example, as 42680089 + 25341156 = 6533^2 + 5034^2 .

It is a cyclic number.

It is not a de Polignac number, because 68021245 - 2¹ = 68021243 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68021243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6802120 + ... + 6802129.

It is an arithmetic number, because the mean of its divisors is an integer number (20406375).

Almost surely, 2^68021245 is an apocalyptic number.

It is an amenable number.

68021245 is a deficient number, since it is larger than the sum of its proper divisors (13604255).

68021245 is a wasteful number, since it uses less digits than its factorization.

68021245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13604254.

The product of its (nonzero) digits is 3840, while the sum is 28.

The square root of 68021245 is about 8247.4993179751. The cubic root of 68021245 is about 408.2080130023.

The spelling of 68021245 in words is "sixty-eight million, twenty-one thousand, two hundred forty-five".