68660643 has 4 divisors (see below), whose sum is σ = 91547528. Its totient is φ = 45773760.
The previous prime is 68660617. The next prime is 68660677. The reversal of 68660643 is 34606686.
It is a semiprime because it is the product of two primes.
It is not a de Polignac number, because 68660643 - 29 = 68660131 is a prime.
It is a Duffinian number.
It is a plaindrome in base 13.
It is not an unprimeable number, because it can be changed into a prime (68660693) 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, 11443438 + ... + 11443443.
It is an arithmetic number, because the mean of its divisors is an integer number (22886882).
Almost surely, 268660643 is an apocalyptic number.
68660643 is a deficient number, since it is larger than the sum of its proper divisors (22886885).
68660643 is a wasteful number, since it uses less digits than its factorization.
68660643 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 22886884.
The product of its (nonzero) digits is 124416, while the sum is 39.
The square root of 68660643 is about 8286.1717940192. The cubic root of 68660643 is about 409.4830744941.
The spelling of 68660643 in words is "sixty-eight million, six hundred sixty thousand, six hundred forty-three".
• e-mail: info -at- numbersaplenty.com • Privacy notice • done in 0.062 sec. • engine limits •