78224447 has 8 divisors (see below), whose sum is σ = 89655456. Its totient is φ = 66857472.

The previous prime is 78224437. The next prime is 78224453. The reversal of 78224447 is 74442287.

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

It is a cyclic number.

It is not a de Polignac number, because 78224447 - 2²⁶ = 11115583 is a prime.

It is a super-2 number, since 2×78224447² = 12238128216911618, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 78224447.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78224417) 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, 13358 + ... + 18299.

It is an arithmetic number, because the mean of its divisors is an integer number (11206932).

Almost surely, 2^78224447 is an apocalyptic number.

78224447 is a deficient number, since it is larger than the sum of its proper divisors (11431009).

78224447 is a wasteful number, since it uses less digits than its factorization.

78224447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32017.

The product of its digits is 100352, while the sum is 38.

The square root of 78224447 is about 8844.4585475879. The cubic root of 78224447 is about 427.6752985355.

The spelling of 78224447 in words is "seventy-eight million, two hundred twenty-four thousand, four hundred forty-seven".