66448420 has 12 divisors (see below), whose sum is σ = 139541724. Its totient is φ = 26579360.

The previous prime is 66448409. The next prime is 66448433. The reversal of 66448420 is 2484466.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 16208676 + 50239744 = 4026^2 + 7088^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1661191 + ... + 1661230.

It is an arithmetic number, because the mean of its divisors is an integer number (11628477).

Almost surely, 2^66448420 is an apocalyptic number.

It is an amenable number.

66448420 is an abundant number, since it is smaller than the sum of its proper divisors (73093304).

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

66448420 is a wasteful number, since it uses less digits than its factorization.

66448420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3322430 (or 3322428 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 34.

The square root of 66448420 is about 8151.5900289453. The cubic root of 66448420 is about 405.0371758792.

The spelling of 66448420 in words is "sixty-six million, four hundred forty-eight thousand, four hundred twenty".