7878226 has 8 divisors (see below), whose sum is σ = 11897100. Its totient is φ = 3912528.

The previous prime is 7878197. The next prime is 7878229. The reversal of 7878226 is 6228787.

It can be written as a sum of positive squares in 2 ways, for example, as 7868025 + 10201 = 2805^2 + 101^2 .

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

It is an Ulam number.

It is a d-powerful number, because it can be written as 7² + 8⁴ + 7⁸ + 8⁴ + 2⁸ + 2²¹ + 6⁵ .

It is not an unprimeable number, because it can be changed into a prime (7878229) 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 3 ways as a sum of consecutive naturals, for example, 12921 + ... + 13516.

Almost surely, 2^7878226 is an apocalyptic number.

7878226 is a deficient number, since it is larger than the sum of its proper divisors (4018874).

7878226 is a wasteful number, since it uses less digits than its factorization.

7878226 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26588.

The product of its digits is 75264, while the sum is 40.

The square root of 7878226 is about 2806.8177710710. The cubic root of 7878226 is about 198.9800237517.

The spelling of 7878226 in words is "seven million, eight hundred seventy-eight thousand, two hundred twenty-six".