664654344 has 48 divisors (see below), whose sum is σ = 1693750800. Its totient is φ = 217349184.

The previous prime is 664654343. The next prime is 664654349. The reversal of 664654344 is 443456466.

It is a junction number, because it is equal to n+sod(n) for n = 664654296 and 664654305.

It is not an unprimeable number, because it can be changed into a prime (664654343) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 62487 + ... + 72345.

It is an arithmetic number, because the mean of its divisors is an integer number (35286475).

Almost surely, 2^664654344 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 664654344, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (846875400).

664654344 is an abundant number, since it is smaller than the sum of its proper divisors (1029096456).

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

664654344 is a wasteful number, since it uses less digits than its factorization.

664654344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9974 (or 9917 counting only the distinct ones).

The product of its digits is 829440, while the sum is 42.

The square root of 664654344 is about 25780.8910629559. The cubic root of 664654344 is about 872.7006159866.

The spelling of 664654344 in words is "six hundred sixty-four million, six hundred fifty-four thousand, three hundred forty-four".