68361493 has 4 divisors (see below), whose sum is σ = 68860620. Its totient is φ = 67862368.

The previous prime is 68361463. The next prime is 68361499. The reversal of 68361493 is 39416386.

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 15697444 + 52664049 = 3962^2 + 7257^2 .

It is a cyclic number.

It is not a de Polignac number, because 68361493 - 2¹³ = 68353301 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 (68361499) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 249358 + ... + 249631.

It is an arithmetic number, because the mean of its divisors is an integer number (17215155).

Almost surely, 2^68361493 is an apocalyptic number.

It is an amenable number.

68361493 is a deficient number, since it is larger than the sum of its proper divisors (499127).

68361493 is a wasteful number, since it uses less digits than its factorization.

68361493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 499126.

The product of its digits is 93312, while the sum is 40.

The square root of 68361493 is about 8268.1009306854. The cubic root of 68361493 is about 408.8875115831.

The spelling of 68361493 in words is "sixty-eight million, three hundred sixty-one thousand, four hundred ninety-three".