68144691 has 4 divisors (see below), whose sum is σ = 90859592. Its totient is φ = 45429792.

The previous prime is 68144683. The next prime is 68144707. The reversal of 68144691 is 19644186.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 68144691 - 2³ = 68144683 is a prime.

It is a super-2 number, since 2×68144691² = 9287397822970962, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68144651) 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, 11357446 + ... + 11357451.

It is an arithmetic number, because the mean of its divisors is an integer number (22714898).

Almost surely, 2^68144691 is an apocalyptic number.

68144691 is a deficient number, since it is larger than the sum of its proper divisors (22714901).

68144691 is a wasteful number, since it uses less digits than its factorization.

68144691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22714900.

The product of its digits is 41472, while the sum is 39.

The square root of 68144691 is about 8254.9797698117. The cubic root of 68144691 is about 408.4548044923.

The spelling of 68144691 in words is "sixty-eight million, one hundred forty-four thousand, six hundred ninety-one".