664045500 has 96 divisors (see below), whose sum is σ = 2047526208. Its totient is φ = 166656000.

The previous prime is 664045477. The next prime is 664045507. The reversal of 664045500 is 5540466.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664045507) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 12480 + ... + 38520.

It is an arithmetic number, because the mean of its divisors is an integer number (21328398).

Almost surely, 2^664045500 is an apocalyptic number.

664045500 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 664045500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1023763104).

664045500 is an abundant number, since it is smaller than the sum of its proper divisors (1383480708).

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

664045500 is a wasteful number, since it uses less digits than its factorization.

664045500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26080 (or 26068 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 30.

The square root of 664045500 is about 25769.0803095493. The cubic root of 664045500 is about 872.4340609659.

Adding to 664045500 its reverse (5540466), we get a palindrome (669585966).

The spelling of 664045500 in words is "six hundred sixty-four million, forty-five thousand, five hundred".