66008420 has 24 divisors (see below), whose sum is σ = 139454784. Its totient is φ = 26243936.

The previous prime is 66008419. The next prime is 66008429. The reversal of 66008420 is 2480066.

It is a super-2 number, since 2×66008420² = 8714223021792800, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 66008420.

It is not an unprimeable number, because it can be changed into a prime (66008429) 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, 6542 + ... + 13221.

It is an arithmetic number, because the mean of its divisors is an integer number (5810616).

Almost surely, 2^66008420 is an apocalyptic number.

It is an amenable number.

66008420 is an abundant number, since it is smaller than the sum of its proper divisors (73446364).

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

66008420 is a wasteful number, since it uses less digits than its factorization.

66008420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19939 (or 19937 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 26.

The square root of 66008420 is about 8124.5566032861. The cubic root of 66008420 is about 404.1411868067.

Adding to 66008420 its reverse (2480066), we get a palindrome (68488486).

The spelling of 66008420 in words is "sixty-six million, eight thousand, four hundred twenty".