664589340 has 96 divisors (see below), whose sum is σ = 2071345920. Its totient is φ = 176904000.

The previous prime is 664589311. The next prime is 664589363. The reversal of 664589340 is 43985466.

664589340 is a `hidden beast` number, since 6 + 64 + 589 + 3 + 4 + 0 = 666.

664589340 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 566955 + ... + 568125.

It is an arithmetic number, because the mean of its divisors is an integer number (21576520).

Almost surely, 2^664589340 is an apocalyptic number.

664589340 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 664589340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1035672960).

664589340 is an abundant number, since it is smaller than the sum of its proper divisors (1406756580).

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

664589340 is a wasteful number, since it uses less digits than its factorization.

664589340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2240 (or 2232 counting only the distinct ones).

The product of its (nonzero) digits is 622080, while the sum is 45.

The square root of 664589340 is about 25779.6303309415. The cubic root of 664589340 is about 872.6721646666.

The spelling of 664589340 in words is "six hundred sixty-four million, five hundred eighty-nine thousand, three hundred forty".