68128449 has 4 divisors (see below), whose sum is σ = 90837936. Its totient is φ = 45418964.

The previous prime is 68128441. The next prime is 68128457. The reversal of 68128449 is 94482186.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (68128441) and next prime (68128457).

It is a cyclic number.

It is not a de Polignac number, because 68128449 - 2³ = 68128441 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 68128449.

It is not an unprimeable number, because it can be changed into a prime (68128441) 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, 11354739 + ... + 11354744.

It is an arithmetic number, because the mean of its divisors is an integer number (22709484).

Almost surely, 2^68128449 is an apocalyptic number.

It is an amenable number.

68128449 is a deficient number, since it is larger than the sum of its proper divisors (22709487).

68128449 is a wasteful number, since it uses less digits than its factorization.

68128449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22709486.

The product of its digits is 110592, while the sum is 42.

The square root of 68128449 is about 8253.9959413608. The cubic root of 68128449 is about 408.4223507532.

The spelling of 68128449 in words is "sixty-eight million, one hundred twenty-eight thousand, four hundred forty-nine".