8164638 has 40 divisors (see below), whose sum is σ = 18513000. Its totient is φ = 2689200.

The previous prime is 8164621. The next prime is 8164643. The reversal of 8164638 is 8364618.

It is a happy number.

8164638 is a `hidden beast` number, since 8 + 1 + 646 + 3 + 8 = 666.

It is a super-2 number, since 2×8164638² = 133322627342088, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 16113 + ... + 16611.

It is an arithmetic number, because the mean of its divisors is an integer number (462825).

Almost surely, 2^8164638 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 8164638, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9256500).

8164638 is an abundant number, since it is smaller than the sum of its proper divisors (10348362).

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

8164638 is a wasteful number, since it uses less digits than its factorization.

8164638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 614 (or 605 counting only the distinct ones).

The product of its digits is 27648, while the sum is 36.

The square root of 8164638 is about 2857.3830684737. The cubic root of 8164638 is about 201.3626777933.

The spelling of 8164638 in words is "eight million, one hundred sixty-four thousand, six hundred thirty-eight".