664063740 has 72 divisors (see below), whose sum is σ = 2016574560. Its totient is φ = 176886144.

The previous prime is 664063739. The next prime is 664063811. The reversal of 664063740 is 47360466.

664063740 is a `hidden beast` number, since 6 + 640 + 6 + 3 + 7 + 4 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 664063695 and 664063704.

It is a congruent number.

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, 236022 + ... + 238818.

It is an arithmetic number, because the mean of its divisors is an integer number (28007980).

Almost surely, 2^664063740 is an apocalyptic number.

664063740 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

664063740 is an abundant number, since it is smaller than the sum of its proper divisors (1352510820).

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

664063740 is a wasteful number, since it uses less digits than its factorization.

664063740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4131 (or 4126 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 36.

The square root of 664063740 is about 25769.4342196332. The cubic root of 664063740 is about 872.4420488982.

The spelling of 664063740 in words is "six hundred sixty-four million, sixty-three thousand, seven hundred forty".