66220308 has 96 divisors (see below), whose sum is σ = 214072320. Its totient is φ = 17197920.

The previous prime is 66220291. The next prime is 66220337. The reversal of 66220308 is 80302266.

66220308 = 17² + 18² + ... + 583².

66220308 is a `hidden beast` number, since 6 + 622 + 0 + 30 + 8 = 666.

66220308 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×66220308² = 8770258383229728, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

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 31 ways as a sum of consecutive naturals, for example, 4335 + ... + 12297.

It is an arithmetic number, because the mean of its divisors is an integer number (2229920).

Almost surely, 2^66220308 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66220308, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (107036160).

66220308 is an abundant number, since it is smaller than the sum of its proper divisors (147852012).

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

66220308 is a wasteful number, since it uses less digits than its factorization.

66220308 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7994 (or 7986 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 66220308 is about 8137.5861285765. The cubic root of 66220308 is about 404.5731579778.

The spelling of 66220308 in words is "sixty-six million, two hundred twenty thousand, three hundred eight".