664662460 has 72 divisors (see below), whose sum is σ = 1771311024. Its totient is φ = 207164160.

The previous prime is 664662457. The next prime is 664662461. The reversal of 664662460 is 64266466.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664662461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 20049 + ... + 41608.

It is an arithmetic number, because the mean of its divisors is an integer number (24601542).

Almost surely, 2^664662460 is an apocalyptic number.

It is an amenable number.

664662460 is an abundant number, since it is smaller than the sum of its proper divisors (1106648564).

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

664662460 is a wasteful number, since it uses less digits than its factorization.

664662460 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61691 (or 61682 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 40.

The square root of 664662460 is about 25781.0484658790. The cubic root of 664662460 is about 872.7041681133.

The spelling of 664662460 in words is "six hundred sixty-four million, six hundred sixty-two thousand, four hundred sixty".