664054820 has 48 divisors (see below), whose sum is σ = 1638318528. Its totient is φ = 222898560.

The previous prime is 664054817. The next prime is 664054823. The reversal of 664054820 is 28450466.

It is an interprime number because it is at equal distance from previous prime (664054817) and next prime (664054823).

It is not an unprimeable number, because it can be changed into a prime (664054823) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 113234 + ... + 118953.

It is an arithmetic number, because the mean of its divisors is an integer number (34131636).

Almost surely, 2^664054820 is an apocalyptic number.

It is an amenable number.

664054820 is an abundant number, since it is smaller than the sum of its proper divisors (974263708).

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

664054820 is a wasteful number, since it uses less digits than its factorization.

664054820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 232220 (or 232218 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 35.

The square root of 664054820 is about 25769.2611457915. The cubic root of 664054820 is about 872.4381425373.

The spelling of 664054820 in words is "six hundred sixty-four million, fifty-four thousand, eight hundred twenty".