64668138 has 32 divisors (see below), whose sum is σ = 131414400. Its totient is φ = 21212736.

The previous prime is 64668133. The next prime is 64668151. The reversal of 64668138 is 83186646.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 64668138.

It is not an unprimeable number, because it can be changed into a prime (64668133) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 166048 + ... + 166436.

It is an arithmetic number, because the mean of its divisors is an integer number (4106700).

Almost surely, 2^64668138 is an apocalyptic number.

64668138 is an abundant number, since it is smaller than the sum of its proper divisors (66746262).

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

64668138 is a wasteful number, since it uses less digits than its factorization.

64668138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 766.

The product of its digits is 165888, while the sum is 42.

The square root of 64668138 is about 8041.6502037828. The cubic root of 64668138 is about 401.3871382250.

The spelling of 64668138 in words is "sixty-four million, six hundred sixty-eight thousand, one hundred thirty-eight".