66744438 has 16 divisors (see below), whose sum is σ = 134262576. Its totient is φ = 22119200.

The previous prime is 66744427. The next prime is 66744443. The reversal of 66744438 is 83444766.

It is a self number, because there is not a number n which added to its sum of digits gives 66744438.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31113 + ... + 33188.

It is an arithmetic number, because the mean of its divisors is an integer number (8391411).

Almost surely, 2^66744438 is an apocalyptic number.

66744438 is an abundant number, since it is smaller than the sum of its proper divisors (67518138).

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

66744438 is a wasteful number, since it uses less digits than its factorization.

66744438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64479.

The product of its digits is 387072, while the sum is 42.

The square root of 66744438 is about 8169.7269232209. The cubic root of 66744438 is about 405.6377454184.

The spelling of 66744438 in words is "sixty-six million, seven hundred forty-four thousand, four hundred thirty-eight".