66042420 has 48 divisors (see below), whose sum is σ = 187272960. Its totient is φ = 17387136.

The previous prime is 66042419. The next prime is 66042421. The reversal of 66042420 is 2424066.

It is an interprime number because it is at equal distance from previous prime (66042419) and next prime (66042421).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66042421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2227 + ... + 11706.

It is an arithmetic number, because the mean of its divisors is an integer number (3901520).

Almost surely, 2^66042420 is an apocalyptic number.

66042420 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

66042420 is an abundant number, since it is smaller than the sum of its proper divisors (121230540).

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

66042420 is a wasteful number, since it uses less digits than its factorization.

66042420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14024 (or 14022 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 24.

The square root of 66042420 is about 8126.6487557910. The cubic root of 66042420 is about 404.2105640255.

Adding to 66042420 its reverse (2424066), we get a palindrome (68466486).

The spelling of 66042420 in words is "sixty-six million, forty-two thousand, four hundred twenty".