664877247 has 32 divisors (see below), whose sum is σ = 922393344. Its totient is φ = 425779200.

The previous prime is 664877221. The next prime is 664877249. The reversal of 664877247 is 742778466.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-664877247 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 664877247.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664877249) 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 31 ways as a sum of consecutive naturals, for example, 2586943 + ... + 2587199.

It is an arithmetic number, because the mean of its divisors is an integer number (28824792).

Almost surely, 2^664877247 is an apocalyptic number.

664877247 is a gapful number since it is divisible by the number (67) formed by its first and last digit.

664877247 is a deficient number, since it is larger than the sum of its proper divisors (257516097).

664877247 is a wasteful number, since it uses less digits than its factorization.

664877247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 599.

The product of its digits is 3161088, while the sum is 51.

The square root of 664877247 is about 25785.2137280264. The cubic root of 664877247 is about 872.7981633535.

The spelling of 664877247 in words is "six hundred sixty-four million, eight hundred seventy-seven thousand, two hundred forty-seven".