664040460 has 96 divisors (see below), whose sum is σ = 1928908800. Its totient is φ = 170507520.

The previous prime is 664040437. The next prime is 664040467. The reversal of 664040460 is 64040466.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (664040467) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 425161 + ... + 426719.

It is an arithmetic number, because the mean of its divisors is an integer number (20092800).

Almost surely, 2^664040460 is an apocalyptic number.

664040460 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 664040460, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (964454400).

664040460 is an abundant number, since it is smaller than the sum of its proper divisors (1264868340).

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

664040460 is a wasteful number, since it uses less digits than its factorization.

664040460 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1831 (or 1829 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 30.

The square root of 664040460 is about 25768.9825177480. The cubic root of 664040460 is about 872.4318537483.

The spelling of 664040460 in words is "six hundred sixty-four million, forty thousand, four hundred sixty".