66438270 has 48 divisors (see below), whose sum is σ = 178319232. Its totient is φ = 17144640.

The previous prime is 66438257. The next prime is 66438277. The reversal of 66438270 is 7283466.

66438270 is a `hidden beast` number, since 6 + 643 + 8 + 2 + 7 + 0 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66438277) 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 23 ways as a sum of consecutive naturals, for example, 9117 + ... + 14696.

It is an arithmetic number, because the mean of its divisors is an integer number (3714984).

Almost surely, 2^66438270 is an apocalyptic number.

66438270 is an abundant number, since it is smaller than the sum of its proper divisors (111880962).

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

66438270 is a wasteful number, since it uses less digits than its factorization.

66438270 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23857 (or 23854 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 36.

The square root of 66438270 is about 8150.9674272444. The cubic root of 66438270 is about 405.0165516784.

The spelling of 66438270 in words is "sixty-six million, four hundred thirty-eight thousand, two hundred seventy".