66026220 has 48 divisors (see below), whose sum is σ = 199096800. Its totient is φ = 16252416.

The previous prime is 66026209. The next prime is 66026231. The reversal of 66026220 is 2262066.

It is an interprime number because it is at equal distance from previous prime (66026209) and next prime (66026231).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 41545 + ... + 43104.

It is an arithmetic number, because the mean of its divisors is an integer number (4147850).

Almost surely, 2^66026220 is an apocalyptic number.

66026220 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

66026220 is an abundant number, since it is smaller than the sum of its proper divisors (133070580).

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

66026220 is a wasteful number, since it uses less digits than its factorization.

66026220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84674 (or 84672 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 24.

The square root of 66026220 is about 8125.6519738419. The cubic root of 66026220 is about 404.1775107918.

Adding to 66026220 its reverse (2262066), we get a palindrome (68288286).

The spelling of 66026220 in words is "sixty-six million, twenty-six thousand, two hundred twenty".