664477634 has 8 divisors (see below), whose sum is σ = 1017923328. Its totient is φ = 325169860.

The previous prime is 664477573. The next prime is 664477643. The reversal of 664477634 is 436774466.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Harshad number since it is a multiple of its sum of digits (47).

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 3534362 + ... + 3534549.

It is an arithmetic number, because the mean of its divisors is an integer number (127240416).

Almost surely, 2^664477634 is an apocalyptic number.

664477634 is a deficient number, since it is larger than the sum of its proper divisors (353445694).

664477634 is a wasteful number, since it uses less digits than its factorization.

664477634 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7068960.

The product of its digits is 2032128, while the sum is 47.

The square root of 664477634 is about 25777.4636843891. The cubic root of 664477634 is about 872.6232682162.

The spelling of 664477634 in words is "six hundred sixty-four million, four hundred seventy-seven thousand, six hundred thirty-four".