664567420 has 24 divisors (see below), whose sum is σ = 1522464048. Its totient is φ = 241660800.

The previous prime is 664567411. The next prime is 664567447. The reversal of 664567420 is 24765466.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 1510161 + ... + 1510600.

It is an arithmetic number, because the mean of its divisors is an integer number (63436002).

Almost surely, 2^664567420 is an apocalyptic number.

It is an amenable number.

664567420 is an abundant number, since it is smaller than the sum of its proper divisors (857896628).

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

664567420 is a wasteful number, since it uses less digits than its factorization.

664567420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3020781 (or 3020779 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 40.

The square root of 664567420 is about 25779.2051855754. The cubic root of 664567420 is about 872.6625701782.

The spelling of 664567420 in words is "six hundred sixty-four million, five hundred sixty-seven thousand, four hundred twenty".