68628407 has 4 divisors (see below), whose sum is σ = 68825400. Its totient is φ = 68431416.

The previous prime is 68628397. The next prime is 68628419. The reversal of 68628407 is 70482686.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-68628407 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 (68628607) 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, 97973 + ... + 98670.

It is an arithmetic number, because the mean of its divisors is an integer number (17206350).

Almost surely, 2^68628407 is an apocalyptic number.

68628407 is a deficient number, since it is larger than the sum of its proper divisors (196993).

68628407 is a wasteful number, since it uses less digits than its factorization.

68628407 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 196992.

The product of its (nonzero) digits is 129024, while the sum is 41.

The square root of 68628407 is about 8284.2263971961. The cubic root of 68628407 is about 409.4189807030.

The spelling of 68628407 in words is "sixty-eight million, six hundred twenty-eight thousand, four hundred seven".