68578643 has 4 divisors (see below), whose sum is σ = 78375600. Its totient is φ = 58781688.

The previous prime is 68578633. The next prime is 68578669. The reversal of 68578643 is 34687586.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34687586 = 2 ⋅17343793.

It is not a de Polignac number, because 68578643 - 2¹² = 68574547 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68578633) 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, 4898468 + ... + 4898481.

It is an arithmetic number, because the mean of its divisors is an integer number (19593900).

Almost surely, 2^68578643 is an apocalyptic number.

68578643 is a deficient number, since it is larger than the sum of its proper divisors (9796957).

68578643 is an equidigital number, since it uses as much as digits as its factorization.

68578643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9796956.

The product of its digits is 967680, while the sum is 47.

The square root of 68578643 is about 8281.2223131613. Note that the first 3 decimals coincide. The cubic root of 68578643 is about 409.3199971399.

The spelling of 68578643 in words is "sixty-eight million, five hundred seventy-eight thousand, six hundred forty-three".