78252218 has 16 divisors (see below), whose sum is σ = 128589120. Its totient is φ = 35419200.

The previous prime is 78252211. The next prime is 78252247. The reversal of 78252218 is 81225287.

It is a super-2 number, since 2×78252218² = 12246819243839048, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (78252211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2078 + ... + 12681.

It is an arithmetic number, because the mean of its divisors is an integer number (8036820).

Almost surely, 2^78252218 is an apocalyptic number.

78252218 is a deficient number, since it is larger than the sum of its proper divisors (50336902).

78252218 is a wasteful number, since it uses less digits than its factorization.

78252218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15013.

The product of its digits is 17920, while the sum is 35.

The square root of 78252218 is about 8846.0283743610. The cubic root of 78252218 is about 427.7259031991.

The spelling of 78252218 in words is "seventy-eight million, two hundred fifty-two thousand, two hundred eighteen".