664428370 has 32 divisors (see below), whose sum is σ = 1278426240. Its totient is φ = 248012160.

The previous prime is 664428353. The next prime is 664428379. The reversal of 664428370 is 73824466.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (664428379) 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 15 ways as a sum of consecutive naturals, for example, 25800 + ... + 44659.

It is an arithmetic number, because the mean of its divisors is an integer number (39950820).

Almost surely, 2^664428370 is an apocalyptic number.

664428370 is a deficient number, since it is larger than the sum of its proper divisors (613997870).

664428370 is a wasteful number, since it uses less digits than its factorization.

664428370 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70530.

The product of its (nonzero) digits is 193536, while the sum is 40.

The square root of 664428370 is about 25776.5081033099. The cubic root of 664428370 is about 872.6017024163.

The spelling of 664428370 in words is "six hundred sixty-four million, four hundred twenty-eight thousand, three hundred seventy".