664888452 has 48 divisors (see below), whose sum is σ = 1613136000. Its totient is φ = 212889600.

The previous prime is 664888397. The next prime is 664888457. The reversal of 664888452 is 254888466.

It is a hoax number, since the sum of its digits (51) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 664888395 and 664888404.

It is not an unprimeable number, because it can be changed into a prime (664888457) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 64452 + ... + 74052.

It is an arithmetic number, because the mean of its divisors is an integer number (33607000).

Almost surely, 2^664888452 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 664888452, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (806568000).

664888452 is an abundant number, since it is smaller than the sum of its proper divisors (948247548).

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

664888452 is a wasteful number, since it uses less digits than its factorization.

664888452 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9836 (or 9834 counting only the distinct ones).

The product of its digits is 2949120, while the sum is 51.

The square root of 664888452 is about 25785.4310027969. The cubic root of 664888452 is about 872.8030663380.

The spelling of 664888452 in words is "six hundred sixty-four million, eight hundred eighty-eight thousand, four hundred fifty-two".