66870638 has 8 divisors (see below), whose sum is σ = 100344288. Its totient is φ = 33422544.

The previous prime is 66870619. The next prime is 66870649. The reversal of 66870638 is 83607866.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2795 + ... + 11897.

It is an arithmetic number, because the mean of its divisors is an integer number (12543036).

Almost surely, 2^66870638 is an apocalyptic number.

66870638 is a deficient number, since it is larger than the sum of its proper divisors (33473650).

66870638 is a wasteful number, since it uses less digits than its factorization.

66870638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12778.

The product of its (nonzero) digits is 290304, while the sum is 44.

The square root of 66870638 is about 8177.4469120869. The cubic root of 66870638 is about 405.8932436275.

The spelling of 66870638 in words is "sixty-six million, eight hundred seventy thousand, six hundred thirty-eight".