7878624 has 96 divisors (see below), whose sum is σ = 22861440. Its totient is φ = 2360832.

The previous prime is 7878613. The next prime is 7878641. The reversal of 7878624 is 4268787.

It is a tau number, because it is divible by the number of its divisors (96).

It is a super-2 number, since 2×7878624² = 124145432266752, which contains 22 as substring.

Its product of digits (150528) is a multiple of the sum of its prime factors (192).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 73579 + ... + 73685.

It is an arithmetic number, because the mean of its divisors is an integer number (238140).

Almost surely, 2^7878624 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 7878624, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11430720).

7878624 is an abundant number, since it is smaller than the sum of its proper divisors (14982816).

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

7878624 is a wasteful number, since it uses less digits than its factorization.

7878624 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 192 (or 184 counting only the distinct ones).

The product of its digits is 150528, while the sum is 42.

The square root of 7878624 is about 2806.8886689714. Note that the first 3 decimals coincide. The cubic root of 7878624 is about 198.9833744517.

The spelling of 7878624 in words is "seven million, eight hundred seventy-eight thousand, six hundred twenty-four".