68780449 has 4 divisors (see below), whose sum is σ = 69001920. Its totient is φ = 68558980.

The previous prime is 68780401. The next prime is 68780461. The reversal of 68780449 is 94408786.

It is a happy number.

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 a cyclic number.

It is not a de Polignac number, because 68780449 - 2⁷ = 68780321 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 68780399 and 68780408.

It is not an unprimeable number, because it can be changed into a prime (68780749) 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, 110269 + ... + 110890.

It is an arithmetic number, because the mean of its divisors is an integer number (17250480).

Almost surely, 2^68780449 is an apocalyptic number.

It is an amenable number.

68780449 is a deficient number, since it is larger than the sum of its proper divisors (221471).

68780449 is a wasteful number, since it uses less digits than its factorization.

68780449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 221470.

The product of its (nonzero) digits is 387072, while the sum is 46.

The square root of 68780449 is about 8293.3979164152. The cubic root of 68780449 is about 409.7211051942.

The spelling of 68780449 in words is "sixty-eight million, seven hundred eighty thousand, four hundred forty-nine".