7999878 has 8 divisors (see below), whose sum is σ = 15999768. Its totient is φ = 2666624.

The previous prime is 7999847. The next prime is 7999909. The reversal of 7999878 is 8789997.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (7999847) and next prime (7999909).

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

7999878 is an admirable number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 666651 + ... + 666662.

It is an arithmetic number, because the mean of its divisors is an integer number (1999971).

Almost surely, 2^7999878 is an apocalyptic number.

7999878 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

7999878 is a wasteful number, since it uses less digits than its factorization.

7999878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1333318.

The product of its digits is 2286144, while the sum is 57.

The square root of 7999878 is about 2828.4055579071. The cubic root of 7999878 is about 199.9989833282.

The spelling of 7999878 in words is "seven million, nine hundred ninety-nine thousand, eight hundred seventy-eight".