664787466 has 128 divisors (see below), whose sum is σ = 1791897600. Its totient is φ = 178459200.

The previous prime is 664787443. The next prime is 664787471.

It is a happy number.

664787466 is a `hidden beast` number, since 66 + 47 + 87 + 466 = 666.

664787466 is nontrivially palindromic in base 10.

It is a Harshad number since it is a multiple of its sum of digits (54).

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 63 ways as a sum of consecutive naturals, for example, 1084176 + ... + 1084788.

It is an arithmetic number, because the mean of its divisors is an integer number (13999200).

Almost surely, 2^664787466 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 664787466, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (895948800).

664787466 is an abundant number, since it is smaller than the sum of its proper divisors (1127110134).

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

664787466 is a wasteful number, since it uses less digits than its factorization.

664787466 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 801 (or 795 counting only the distinct ones).

The product of its digits is 8128512, while the sum is 54.

The square root of 664787466 is about 25783.4727296383. The cubic root of 664787466 is about 872.7588757910.

The spelling of 664787466 in words is "six hundred sixty-four million, seven hundred eighty-seven thousand, four hundred sixty-six".