64138386 has 32 divisors (see below), whose sum is σ = 139220928. Its totient is φ = 19581120.

The previous prime is 64138379. The next prime is 64138397. The reversal of 64138386 is 68383146.

64138386 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×64138386² = 8227465117369992, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39).

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 15 ways as a sum of consecutive naturals, for example, 7080 + ... + 13356.

It is an arithmetic number, because the mean of its divisors is an integer number (4350654).

Almost surely, 2^64138386 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64138386, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (69610464).

64138386 is an abundant number, since it is smaller than the sum of its proper divisors (75082542).

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

64138386 is a wasteful number, since it uses less digits than its factorization.

64138386 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6426.

The product of its digits is 82944, while the sum is 39.

The square root of 64138386 is about 8008.6444545878. The cubic root of 64138386 is about 400.2880966177.

The spelling of 64138386 in words is "sixty-four million, one hundred thirty-eight thousand, three hundred eighty-six".