67821245 has 8 divisors (see below), whose sum is σ = 86172984. Its totient is φ = 51065344.

The previous prime is 67821179. The next prime is 67821251. The reversal of 67821245 is 54212876.

It can be written as a sum of positive squares in 4 ways, for example, as 630436 + 67190809 = 794^2 + 8197^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 67821245 - 2⁸ = 67820989 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 398864 + ... + 399033.

It is an arithmetic number, because the mean of its divisors is an integer number (10771623).

Almost surely, 2^67821245 is an apocalyptic number.

It is an amenable number.

67821245 is a deficient number, since it is larger than the sum of its proper divisors (18351739).

67821245 is a wasteful number, since it uses less digits than its factorization.

67821245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 797919.

The product of its digits is 26880, while the sum is 35.

The square root of 67821245 is about 8235.3655049427. The cubic root of 67821245 is about 407.8075413097.

The spelling of 67821245 in words is "sixty-seven million, eight hundred twenty-one thousand, two hundred forty-five".