664190748 has 144 divisors (see below), whose sum is σ = 1976921856. Its totient is φ = 186071040.

The previous prime is 664190743. The next prime is 664190749. The reversal of 664190748 is 847091466.

It is a super-2 number, since 2×664190748² = 882298699457599008, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664190743) 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, 245290 + ... + 247982.

It is an arithmetic number, because the mean of its divisors is an integer number (13728624).

Almost surely, 2^664190748 is an apocalyptic number.

664190748 is a gapful number since it is divisible by the number (68) 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 664190748, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (988460928).

664190748 is an abundant number, since it is smaller than the sum of its proper divisors (1312731108).

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

664190748 is a wasteful number, since it uses less digits than its factorization.

664190748 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2764 (or 2759 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 45.

The square root of 664190748 is about 25771.8984166863. The cubic root of 664190748 is about 872.4976660775.

The spelling of 664190748 in words is "six hundred sixty-four million, one hundred ninety thousand, seven hundred forty-eight".