7878520 has 64 divisors (see below), whose sum is σ = 19404000. Its totient is φ = 2861568.

The previous prime is 7878511. The next prime is 7878527. The reversal of 7878520 is 258787.

It is a self number, because there is not a number n which added to its sum of digits gives 7878520.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7878527) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 56611 + ... + 56749.

Almost surely, 2^7878520 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 7878520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9702000).

7878520 is an abundant number, since it is smaller than the sum of its proper divisors (11525480).

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

7878520 is a wasteful number, since it uses less digits than its factorization.

7878520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 272 (or 268 counting only the distinct ones).

The product of its (nonzero) digits is 31360, while the sum is 37.

The square root of 7878520 is about 2806.8701430597. The cubic root of 7878520 is about 198.9824989028.

The spelling of 7878520 in words is "seven million, eight hundred seventy-eight thousand, five hundred twenty".