66042620 has 48 divisors (see below), whose sum is σ = 167832000. Its totient is φ = 21310464.

The previous prime is 66042619. The next prime is 66042623. The reversal of 66042620 is 2624066.

It is a self number, because there is not a number n which added to its sum of digits gives 66042620.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66042623) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11495 + ... + 16254.

It is an arithmetic number, because the mean of its divisors is an integer number (3496500).

Almost surely, 2^66042620 is an apocalyptic number.

It is an amenable number.

66042620 is an abundant number, since it is smaller than the sum of its proper divisors (101789380).

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

66042620 is a wasteful number, since it uses less digits than its factorization.

66042620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27782 (or 27780 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 26.

The square root of 66042620 is about 8126.6610609770. The cubic root of 66042620 is about 404.2109720564.

Adding to 66042620 its reverse (2624066), we get a palindrome (68666686).

The spelling of 66042620 in words is "sixty-six million, forty-two thousand, six hundred twenty".