66128886 has 20 divisors (see below), whose sum is σ = 148178052. Its totient is φ = 22042908.

The previous prime is 66128857. The next prime is 66128891. The reversal of 66128886 is 68882166.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 203940 + ... + 204263.

Almost surely, 2^66128886 is an apocalyptic number.

66128886 is an abundant number, since it is smaller than the sum of its proper divisors (82049166).

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

66128886 is a wasteful number, since it uses less digits than its factorization.

66128886 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 408217 (or 408208 counting only the distinct ones).

The product of its digits is 221184, while the sum is 45.

The square root of 66128886 is about 8131.9669207394. The cubic root of 66128886 is about 404.3868912445.

The spelling of 66128886 in words is "sixty-six million, one hundred twenty-eight thousand, eight hundred eighty-six".