66012420 has 48 divisors (see below), whose sum is σ = 187604928. Its totient is φ = 17339520.

The previous prime is 66012413. The next prime is 66012433. The reversal of 66012420 is 2421066.

It is a happy number.

66012420 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4191 + ... + 12230.

It is an arithmetic number, because the mean of its divisors is an integer number (3908436).

Almost surely, 2^66012420 is an apocalyptic number.

66012420 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

66012420 is an abundant number, since it is smaller than the sum of its proper divisors (121592508).

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

66012420 is a wasteful number, since it uses less digits than its factorization.

66012420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16500 (or 16498 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 66012420 is about 8124.8027668369. The cubic root of 66012420 is about 404.1493500688.

Adding to 66012420 its reverse (2421066), we get a palindrome (68433486).

The spelling of 66012420 in words is "sixty-six million, twelve thousand, four hundred twenty".