66438700 has 36 divisors (see below), whose sum is σ = 144634840. Its totient is φ = 26490240.

The previous prime is 66438583. The next prime is 66438707. The reversal of 66438700 is 783466.

It is not an unprimeable number, because it can be changed into a prime (66438707) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 37024 + ... + 38776.

Almost surely, 2^66438700 is an apocalyptic number.

It is an amenable number.

66438700 is an abundant number, since it is smaller than the sum of its proper divisors (78196140).

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

66438700 is a wasteful number, since it uses less digits than its factorization.

66438700 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2146 (or 2139 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 34.

The square root of 66438700 is about 8150.9938044388. The cubic root of 66438700 is about 405.0174254556.

The spelling of 66438700 in words is "sixty-six million, four hundred thirty-eight thousand, seven hundred".