8381620 has 24 divisors (see below), whose sum is σ = 18955944. Its totient is φ = 3094656.

The previous prime is 8381543. The next prime is 8381627. The reversal of 8381620 is 261838.

It can be written as a sum of positive squares in 4 ways, for example, as 1527696 + 6853924 = 1236^2 + 2618^2 .

It is a hoax number, since the sum of its digits (28) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8381627) 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, 15859 + ... + 16378.

It is an arithmetic number, because the mean of its divisors is an integer number (789831).

Almost surely, 2^8381620 is an apocalyptic number.

It is an amenable number.

8381620 is an abundant number, since it is smaller than the sum of its proper divisors (10574324).

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

8381620 is a wasteful number, since it uses less digits than its factorization.

8381620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32259 (or 32257 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 8381620 is about 2895.1027615613. The cubic root of 8381620 is about 203.1308982903.

The spelling of 8381620 in words is "eight million, three hundred eighty-one thousand, six hundred twenty".