664224015 has 64 divisors (see below), whose sum is σ = 1364944896. Its totient is φ = 268088832.

The previous prime is 664223993. The next prime is 664224047. The reversal of 664224015 is 510422466.

664224015 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 664224015 - 2⁶ = 664223951 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 20817 + ... + 41973.

It is an arithmetic number, because the mean of its divisors is an integer number (21327264).

Almost surely, 2^664224015 is an apocalyptic number.

664224015 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

664224015 is an abundant number, since it is smaller than the sum of its proper divisors (700720881).

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

664224015 is a wasteful number, since it uses less digits than its factorization.

664224015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21208.

The product of its (nonzero) digits is 11520, while the sum is 30.

The square root of 664224015 is about 25772.5438208959. The cubic root of 664224015 is about 872.5122326235.

The spelling of 664224015 in words is "six hundred sixty-four million, two hundred twenty-four thousand, fifteen".