78647226 has 16 divisors (see below), whose sum is σ = 179765184. Its totient is φ = 22470624.

The previous prime is 78647183. The next prime is 78647267. The reversal of 78647226 is 62274687.

It is a Harshad number since it is a multiple of its sum of digits (42), and also a Moran number because the ratio is a prime number: 1872553 = 78647226 / (7 + 8 + 6 + 4 + 7 + 2 + 2 + 6).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 936235 + ... + 936318.

It is an arithmetic number, because the mean of its divisors is an integer number (11235324).

Almost surely, 2^78647226 is an apocalyptic number.

78647226 is an abundant number, since it is smaller than the sum of its proper divisors (101117958).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

78647226 is a wasteful number, since it uses less digits than its factorization.

78647226 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1872565.

The product of its digits is 225792, while the sum is 42.

The square root of 78647226 is about 8868.3271252249. The cubic root of 78647226 is about 428.4443989550. Note that the first 3 decimals are identical.

The spelling of 78647226 in words is "seventy-eight million, six hundred forty-seven thousand, two hundred twenty-six".