7878820 has 24 divisors (see below), whose sum is σ = 17519544. Its totient is φ = 2966016.

The previous prime is 7878809. The next prime is 7878823. The reversal of 7878820 is 288787.

It can be written as a sum of positive squares in 4 ways, for example, as 128164 + 7750656 = 358^2 + 2784^2 .

It is not an unprimeable number, because it can be changed into a prime (7878823) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11247 + ... + 11926.

It is an arithmetic number, because the mean of its divisors is an integer number (729981).

Almost surely, 2^7878820 is an apocalyptic number.

It is an amenable number.

7878820 is an abundant number, since it is smaller than the sum of its proper divisors (9640724).

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

7878820 is a wasteful number, since it uses less digits than its factorization.

7878820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23199 (or 23197 counting only the distinct ones).

The product of its (nonzero) digits is 50176, while the sum is 40.

The square root of 7878820 is about 2806.9235828572. The cubic root of 7878820 is about 198.9850245037.

The spelling of 7878820 in words is "seven million, eight hundred seventy-eight thousand, eight hundred twenty".