66140438 has 32 divisors (see below), whose sum is σ = 129294144. Its totient is φ = 24625152.

The previous prime is 66140419. The next prime is 66140441. The reversal of 66140438 is 83404166.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7595 + ... + 13782.

It is an arithmetic number, because the mean of its divisors is an integer number (4040442).

Almost surely, 2^66140438 is an apocalyptic number.

66140438 is a deficient number, since it is larger than the sum of its proper divisors (63153706).

66140438 is a wasteful number, since it uses less digits than its factorization.

66140438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21416.

The product of its (nonzero) digits is 13824, while the sum is 32.

The square root of 66140438 is about 8132.6771729855. The cubic root of 66140438 is about 404.4104372098.

The spelling of 66140438 in words is "sixty-six million, one hundred forty thousand, four hundred thirty-eight".