664759730 has 8 divisors (see below), whose sum is σ = 1196567532. Its totient is φ = 265903888.

The previous prime is 664759703. The next prime is 664759759. The reversal of 664759730 is 37957466.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 635997961 + 28761769 = 25219^2 + 5363^2 .

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

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 3 ways as a sum of consecutive naturals, for example, 33237977 + ... + 33237996.

Almost surely, 2^664759730 is an apocalyptic number.

664759730 is a deficient number, since it is larger than the sum of its proper divisors (531807802).

664759730 is a wasteful number, since it uses less digits than its factorization.

664759730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66475980.

The product of its (nonzero) digits is 952560, while the sum is 47.

The square root of 664759730 is about 25782.9348600969. The cubic root of 664759730 is about 872.7467379885.

The spelling of 664759730 in words is "six hundred sixty-four million, seven hundred fifty-nine thousand, seven hundred thirty".