8787920 has 20 divisors (see below), whose sum is σ = 20432100. Its totient is φ = 3515136.

The previous prime is 8787917. The next prime is 8787941. The reversal of 8787920 is 297878.

It can be written as a sum of positive squares in 2 ways, for example, as 1860496 + 6927424 = 1364^2 + 2632^2 .

It is a tau number, because it is divible by the number of its divisors (20).

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, 54845 + ... + 55004.

It is an arithmetic number, because the mean of its divisors is an integer number (1021605).

Almost surely, 2^8787920 is an apocalyptic number.

8787920 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

8787920 is an abundant number, since it is smaller than the sum of its proper divisors (11644180).

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

8787920 is a wasteful number, since it uses less digits than its factorization.

8787920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109862 (or 109856 counting only the distinct ones).

The product of its (nonzero) digits is 56448, while the sum is 41.

The square root of 8787920 is about 2964.4426120268. The cubic root of 8787920 is about 206.3615105603.

The spelling of 8787920 in words is "eight million, seven hundred eighty-seven thousand, nine hundred twenty".