78224285 has 8 divisors (see below), whose sum is σ = 93942240. Its totient is φ = 62530704.

The previous prime is 78224257. The next prime is 78224287. The reversal of 78224285 is 58242287.

It is a happy number.

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 78224285 - 2⁶ = 78224221 is a prime.

It is a super-2 number, since 2×78224285² = 12238077527522450, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78224287) 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, 1934 + ... + 12656.

It is an arithmetic number, because the mean of its divisors is an integer number (11742780).

Almost surely, 2^78224285 is an apocalyptic number.

It is an amenable number.

78224285 is a deficient number, since it is larger than the sum of its proper divisors (15717955).

78224285 is a wasteful number, since it uses less digits than its factorization.

78224285 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12187.

The product of its digits is 71680, while the sum is 38.

The square root of 78224285 is about 8844.4493893063. The cubic root of 78224285 is about 427.6750033019.

The spelling of 78224285 in words is "seventy-eight million, two hundred twenty-four thousand, two hundred eighty-five".