66340438 has 16 divisors (see below), whose sum is σ = 105171120. Its totient is φ = 31297536.

The previous prime is 66340433. The next prime is 66340481. The reversal of 66340438 is 83404366.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66340433) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6370 + ... + 13162.

It is an arithmetic number, because the mean of its divisors is an integer number (6573195).

Almost surely, 2^66340438 is an apocalyptic number.

66340438 is a deficient number, since it is larger than the sum of its proper divisors (38830682).

66340438 is a wasteful number, since it uses less digits than its factorization.

66340438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7071.

The product of its (nonzero) digits is 41472, while the sum is 34.

The square root of 66340438 is about 8144.9639655434. The cubic root of 66340438 is about 404.8176550479.

The spelling of 66340438 in words is "sixty-six million, three hundred forty thousand, four hundred thirty-eight".