664701540 has 24 divisors (see below), whose sum is σ = 1861164480. Its totient is φ = 177253728.

The previous prime is 664701523. The next prime is 664701551. The reversal of 664701540 is 45107466.

664701540 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5539120 + ... + 5539239.

It is an arithmetic number, because the mean of its divisors is an integer number (77548520).

Almost surely, 2^664701540 is an apocalyptic number.

664701540 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

664701540 is an abundant number, since it is smaller than the sum of its proper divisors (1196462940).

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

664701540 is a wasteful number, since it uses less digits than its factorization.

664701540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11078371 (or 11078369 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 33.

The square root of 664701540 is about 25781.8063758147. The cubic root of 664701540 is about 872.7212718377.

The spelling of 664701540 in words is "six hundred sixty-four million, seven hundred one thousand, five hundred forty".