8378820 has 36 divisors (see below), whose sum is σ = 25416300. Its totient is φ = 2234304.

The previous prime is 8378809. The next prime is 8378827. The reversal of 8378820 is 288738.

It can be written as a sum of positive squares in 2 ways, for example, as 6110784 + 2268036 = 2472^2 + 1506^2 .

It is a tau number, because it is divible by the number of its divisors (36).

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 (8378827) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 23095 + ... + 23454.

Almost surely, 2^8378820 is an apocalyptic number.

It is an amenable number.

8378820 is an abundant number, since it is smaller than the sum of its proper divisors (17037480).

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

8378820 is a wasteful number, since it uses less digits than its factorization.

8378820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46564 (or 46559 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 36.

The square root of 8378820 is about 2894.6191459327. The cubic root of 8378820 is about 203.1082761774.

The spelling of 8378820 in words is "eight million, three hundred seventy-eight thousand, eight hundred twenty".