66128814 has 24 divisors (see below), whose sum is σ = 143610480. Its totient is φ = 21991968.

The previous prime is 66128807. The next prime is 66128837. The reversal of 66128814 is 41882166.

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, 4207 + ... + 12245.

It is an arithmetic number, because the mean of its divisors is an integer number (5983770).

Almost surely, 2^66128814 is an apocalyptic number.

66128814 is an abundant number, since it is smaller than the sum of its proper divisors (77481666).

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

66128814 is a wasteful number, since it uses less digits than its factorization.

66128814 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8504 (or 8501 counting only the distinct ones).

The product of its digits is 18432, while the sum is 36.

The square root of 66128814 is about 8131.9624937650. The cubic root of 66128814 is about 404.3867444812.

The spelling of 66128814 in words is "sixty-six million, one hundred twenty-eight thousand, eight hundred fourteen".