66235420 has 24 divisors (see below), whose sum is σ = 143892000. Its totient is φ = 25580352.

The previous prime is 66235397. The next prime is 66235427. The reversal of 66235420 is 2453266.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66235427) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 56520 + ... + 57679.

It is an arithmetic number, because the mean of its divisors is an integer number (5995500).

Almost surely, 2^66235420 is an apocalyptic number.

It is an amenable number.

66235420 is an abundant number, since it is smaller than the sum of its proper divisors (77656580).

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

66235420 is a wasteful number, since it uses less digits than its factorization.

66235420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114237 (or 114235 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 28.

The square root of 66235420 is about 8138.5146064869. The cubic root of 66235420 is about 404.6039312392.

Adding to 66235420 its reverse (2453266), we get a palindrome (68688686).

The spelling of 66235420 in words is "sixty-six million, two hundred thirty-five thousand, four hundred twenty".