68844157 has 4 divisors (see below), whose sum is σ = 69089436. Its totient is φ = 68598880.

The previous prime is 68844137. The next prime is 68844179. The reversal of 68844157 is 75144886.

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 60047001 + 8797156 = 7749^2 + 2966^2 .

It is a cyclic number.

It is not a de Polignac number, because 68844157 - 2¹⁵ = 68811389 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68844137) 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, 122218 + ... + 122779.

It is an arithmetic number, because the mean of its divisors is an integer number (17272359).

Almost surely, 2^68844157 is an apocalyptic number.

It is an amenable number.

68844157 is a deficient number, since it is larger than the sum of its proper divisors (245279).

68844157 is a wasteful number, since it uses less digits than its factorization.

68844157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 245278.

The product of its digits is 215040, while the sum is 43.

The square root of 68844157 is about 8297.2379139085. The cubic root of 68844157 is about 409.8475677648.

The spelling of 68844157 in words is "sixty-eight million, eight hundred forty-four thousand, one hundred fifty-seven".