664365474 has 48 divisors (see below), whose sum is σ = 1528745400. Its totient is φ = 207797760.

The previous prime is 664365467. The next prime is 664365497. The reversal of 664365474 is 474563466.

It is a happy number.

664365474 is a `hidden beast` number, since 66 + 43 + 6 + 547 + 4 = 666.

664365474 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 555309225 + 109056249 = 23565^2 + 10443^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 103684 + ... + 109904.

Almost surely, 2^664365474 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 664365474, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (764372700).

664365474 is an abundant number, since it is smaller than the sum of its proper divisors (864379926).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

664365474 is a wasteful number, since it uses less digits than its factorization.

664365474 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6595 (or 6592 counting only the distinct ones).

The product of its digits is 1451520, while the sum is 45.

The square root of 664365474 is about 25775.2880488269. The cubic root of 664365474 is about 872.5741675251.

The spelling of 664365474 in words is "six hundred sixty-four million, three hundred sixty-five thousand, four hundred seventy-four".