66328420 has 24 divisors (see below), whose sum is σ = 143055864. Its totient is φ = 25814016.

The previous prime is 66328397. The next prime is 66328433. The reversal of 66328420 is 2482366.

It can be written as a sum of positive squares in 4 ways, for example, as 4485924 + 61842496 = 2118^2 + 7864^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 44077 + ... + 45556.

It is an arithmetic number, because the mean of its divisors is an integer number (5960661).

Almost surely, 2^66328420 is an apocalyptic number.

It is an amenable number.

66328420 is an abundant number, since it is smaller than the sum of its proper divisors (76727444).

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

66328420 is a wasteful number, since it uses less digits than its factorization.

66328420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89679 (or 89677 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 31.

The square root of 66328420 is about 8144.2261756412. The cubic root of 66328420 is about 404.7932084583.

The spelling of 66328420 in words is "sixty-six million, three hundred twenty-eight thousand, four hundred twenty".