664144500 has 48 divisors (see below), whose sum is σ = 1933993152. Its totient is φ = 177104800.

The previous prime is 664144489. The next prime is 664144513. The reversal of 664144500 is 5441466.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 219882 + ... + 222881.

It is an arithmetic number, because the mean of its divisors is an integer number (40291524).

Almost surely, 2^664144500 is an apocalyptic number.

664144500 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

664144500 is an abundant number, since it is smaller than the sum of its proper divisors (1269848652).

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

664144500 is a wasteful number, since it uses less digits than its factorization.

664144500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 442785 (or 442773 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 30.

The square root of 664144500 is about 25771.0011446975. The cubic root of 664144500 is about 872.4774147623.

Adding to 664144500 its reverse (5441466), we get a palindrome (669585966).

The spelling of 664144500 in words is "six hundred sixty-four million, one hundred forty-four thousand, five hundred".