68378561 has 4 divisors (see below), whose sum is σ = 69833472. Its totient is φ = 66923652.

The previous prime is 68378521. The next prime is 68378593. The reversal of 68378561 is 16587386.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 68378561 - 2²² = 64184257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68378521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 727385 + ... + 727478.

It is an arithmetic number, because the mean of its divisors is an integer number (17458368).

Almost surely, 2^68378561 is an apocalyptic number.

It is an amenable number.

68378561 is a deficient number, since it is larger than the sum of its proper divisors (1454911).

68378561 is a wasteful number, since it uses less digits than its factorization.

68378561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1454910.

The product of its digits is 241920, while the sum is 44.

The square root of 68378561 is about 8269.1330258982. The cubic root of 68378561 is about 408.9215381040.

The spelling of 68378561 in words is "sixty-eight million, three hundred seventy-eight thousand, five hundred sixty-one".