664770288 has 240 divisors, whose sum is σ = 2222000640. Its totient is φ = 167371776.

The previous prime is 664770259. The next prime is 664770289. The reversal of 664770288 is 882077466.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664770289) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1305778 + ... + 1306286.

It is an arithmetic number, because the mean of its divisors is an integer number (9258336).

Almost surely, 2^664770288 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 664770288, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1111000320).

664770288 is an abundant number, since it is smaller than the sum of its proper divisors (1557230352).

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

664770288 is a wasteful number, since it uses less digits than its factorization.

664770288 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 576 (or 557 counting only the distinct ones).

The product of its (nonzero) digits is 903168, while the sum is 48.

The square root of 664770288 is about 25783.1396071153. The cubic root of 664770288 is about 872.7513584104.

The spelling of 664770288 in words is "six hundred sixty-four million, seven hundred seventy thousand, two hundred eighty-eight".