66439700 has 36 divisors (see below), whose sum is σ = 144803232. Its totient is φ = 26460000.

The previous prime is 66439699. The next prime is 66439733. The reversal of 66439700 is 793466.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 23777 + ... + 26423.

It is an arithmetic number, because the mean of its divisors is an integer number (4022312).

Almost surely, 2^66439700 is an apocalyptic number.

It is an amenable number.

66439700 is an abundant number, since it is smaller than the sum of its proper divisors (78363532).

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

66439700 is a wasteful number, since it uses less digits than its factorization.

66439700 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2912 (or 2905 counting only the distinct ones).

The product of its (nonzero) digits is 27216, while the sum is 35.

The square root of 66439700 is about 8151.0551464212. The cubic root of 66439700 is about 405.0194574811.

The spelling of 66439700 in words is "sixty-six million, four hundred thirty-nine thousand, seven hundred".