68645407 has 4 divisors (see below), whose sum is σ = 71012520. Its totient is φ = 66278296.

The previous prime is 68645389. The next prime is 68645411. The reversal of 68645407 is 70454686.

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

It is a cyclic number.

It is not a de Polignac number, because 68645407 - 2²³ = 60256799 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 68645407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68645107) 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, 1183513 + ... + 1183570.

It is an arithmetic number, because the mean of its divisors is an integer number (17753130).

Almost surely, 2^68645407 is an apocalyptic number.

68645407 is a deficient number, since it is larger than the sum of its proper divisors (2367113).

68645407 is a wasteful number, since it uses less digits than its factorization.

68645407 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2367112.

The product of its (nonzero) digits is 161280, while the sum is 40.

The square root of 68645407 is about 8285.2523799822. The cubic root of 68645407 is about 409.4527837512.

The spelling of 68645407 in words is "sixty-eight million, six hundred forty-five thousand, four hundred seven".