7878312 has 96 divisors (see below), whose sum is σ = 24242400. Its totient is φ = 2291328.

The previous prime is 7878301. The next prime is 7878313. The reversal of 7878312 is 2138787.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (7878313) 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 23 ways as a sum of consecutive naturals, for example, 17563 + ... + 18005.

It is an arithmetic number, because the mean of its divisors is an integer number (252525).

Almost surely, 2^7878312 is an apocalyptic number.

7878312 is a gapful number since it is divisible by the number (72) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 7878312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12121200).

7878312 is an abundant number, since it is smaller than the sum of its proper divisors (16364088).

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

7878312 is a wasteful number, since it uses less digits than its factorization.

7878312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 487 (or 480 counting only the distinct ones).

The product of its digits is 18816, while the sum is 36.

The square root of 7878312 is about 2806.8330908695. The cubic root of 7878312 is about 198.9807477819.

The spelling of 7878312 in words is "seven million, eight hundred seventy-eight thousand, three hundred twelve".