66894128 has 20 divisors (see below), whose sum is σ = 148122960. Its totient is φ = 28668864.

The previous prime is 66894127. The next prime is 66894131. The reversal of 66894128 is 82149866.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (66894127) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 298523 + ... + 298746.

It is an arithmetic number, because the mean of its divisors is an integer number (7406148).

Almost surely, 2^66894128 is an apocalyptic number.

It is an amenable number.

66894128 is an abundant number, since it is smaller than the sum of its proper divisors (81228832).

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

66894128 is a wasteful number, since it uses less digits than its factorization.

66894128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 597284 (or 597278 counting only the distinct ones).

The product of its digits is 165888, while the sum is 44.

The square root of 66894128 is about 8178.8830533270. The cubic root of 66894128 is about 405.9407648137.

The spelling of 66894128 in words is "sixty-six million, eight hundred ninety-four thousand, one hundred twenty-eight".