7878906 has 36 divisors (see below), whose sum is σ = 19860282. Its totient is φ = 2250864.

The previous prime is 7878887. The next prime is 7878911. The reversal of 7878906 is 6098787.

It can be written as a sum of positive squares in only one way, i.e., 7338681 + 540225 = 2709^2 + 735^2 .

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a Curzon number.

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 17 ways as a sum of consecutive naturals, for example, 3585 + ... + 5348.

Almost surely, 2^7878906 is an apocalyptic number.

7878906 is an abundant number, since it is smaller than the sum of its proper divisors (11981376).

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

7878906 is a wasteful number, since it uses less digits than its factorization.

7878906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8955 (or 8945 counting only the distinct ones).

The product of its (nonzero) digits is 169344, while the sum is 45.

The square root of 7878906 is about 2806.9389020782. The cubic root of 7878906 is about 198.9857484975.

The spelling of 7878906 in words is "seven million, eight hundred seventy-eight thousand, nine hundred six".