664744402 has 8 divisors (see below), whose sum is σ = 1139561856. Its totient is φ = 284890452.

The previous prime is 664744361. The next prime is 664744403. The reversal of 664744402 is 204447466.

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

It is not an unprimeable number, because it can be changed into a prime (664744403) 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 3 ways as a sum of consecutive naturals, for example, 23740858 + ... + 23740885.

It is an arithmetic number, because the mean of its divisors is an integer number (142445232).

Almost surely, 2^664744402 is an apocalyptic number.

664744402 is a deficient number, since it is larger than the sum of its proper divisors (474817454).

664744402 is a wasteful number, since it uses less digits than its factorization.

664744402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47481752.

The product of its (nonzero) digits is 129024, while the sum is 37.

The square root of 664744402 is about 25782.6376075063. The cubic root of 664744402 is about 872.7400300186.

It can be divided in two parts, 66474 and 4402, that added together give a triangular number (70876 = T₃₇₆).

The spelling of 664744402 in words is "six hundred sixty-four million, seven hundred forty-four thousand, four hundred two".