64909138 has 16 divisors (see below), whose sum is σ = 111985344. Its totient is φ = 27640080.

The previous prime is 64909129. The next prime is 64909139. The reversal of 64909138 is 83190946.

It is a self number, because there is not a number n which added to its sum of digits gives 64909138.

It is not an unprimeable number, because it can be changed into a prime (64909139) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 12568 + ... + 16963.

It is an arithmetic number, because the mean of its divisors is an integer number (6999084).

Almost surely, 2^64909138 is an apocalyptic number.

64909138 is a deficient number, since it is larger than the sum of its proper divisors (47076206).

64909138 is a wasteful number, since it uses less digits than its factorization.

64909138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29697.

The product of its (nonzero) digits is 46656, while the sum is 40.

The square root of 64909138 is about 8056.6207556270. The cubic root of 64909138 is about 401.8851391689.

The spelling of 64909138 in words is "sixty-four million, nine hundred nine thousand, one hundred thirty-eight".