664773420 has 24 divisors (see below), whose sum is σ = 1861365744. Its totient is φ = 177272896.

The previous prime is 664773379. The next prime is 664773427. The reversal of 664773420 is 24377466.

It is not an unprimeable number, because it can be changed into a prime (664773427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5539719 + ... + 5539838.

It is an arithmetic number, because the mean of its divisors is an integer number (77556906).

Almost surely, 2^664773420 is an apocalyptic number.

664773420 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

664773420 is an abundant number, since it is smaller than the sum of its proper divisors (1196592324).

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

664773420 is a wasteful number, since it uses less digits than its factorization.

664773420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11079569 (or 11079567 counting only the distinct ones).

The product of its (nonzero) digits is 169344, while the sum is 39.

The square root of 664773420 is about 25783.2003444103. The cubic root of 664773420 is about 872.7527290357.

The spelling of 664773420 in words is "six hundred sixty-four million, seven hundred seventy-three thousand, four hundred twenty".