64138206 has 64 divisors (see below), whose sum is σ = 144633600. Its totient is φ = 18796800.

The previous prime is 64138189. The next prime is 64138211. The reversal of 64138206 is 60283146.

It is a super-2 number, since 2×64138206² = 8227418937796872, 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 (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 358225 + ... + 358403.

It is an arithmetic number, because the mean of its divisors is an integer number (2259900).

Almost surely, 2^64138206 is an apocalyptic number.

64138206 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 64138206, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (72316800).

64138206 is an abundant number, since it is smaller than the sum of its proper divisors (80495394).

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

64138206 is a wasteful number, since it uses less digits than its factorization.

64138206 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 345.

The product of its (nonzero) digits is 6912, while the sum is 30.

The square root of 64138206 is about 8008.6332167231. The cubic root of 64138206 is about 400.2877221569.

The spelling of 64138206 in words is "sixty-four million, one hundred thirty-eight thousand, two hundred six".