78444249 has 8 divisors (see below), whose sum is σ = 112637952. Its totient is φ = 48273360.

The previous prime is 78444227. The next prime is 78444251. The reversal of 78444249 is 94244487.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 78444249 - 2²⁴ = 61667033 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 78444249.

It is not an unprimeable number, because it can be changed into a prime (78444209) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1005657 + ... + 1005734.

It is an arithmetic number, because the mean of its divisors is an integer number (14079744).

Almost surely, 2^78444249 is an apocalyptic number.

It is an amenable number.

78444249 is a deficient number, since it is larger than the sum of its proper divisors (34193703).

78444249 is a wasteful number, since it uses less digits than its factorization.

78444249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2011407.

The product of its digits is 258048, while the sum is 42.

The square root of 78444249 is about 8856.8758035777. The cubic root of 78444249 is about 428.0754972796.

The spelling of 78444249 in words is "seventy-eight million, four hundred forty-four thousand, two hundred forty-nine".