663975432 has 96 divisors (see below), whose sum is σ = 1835477280. Its totient is φ = 216794880.

The previous prime is 663975421. The next prime is 663975437. The reversal of 663975432 is 234579366.

663975432 is a `hidden beast` number, since 6 + 639 + 7 + 5 + 4 + 3 + 2 = 666.

It is not an unprimeable number, because it can be changed into a prime (663975437) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 818307 + ... + 819117.

It is an arithmetic number, because the mean of its divisors is an integer number (19119555).

Almost surely, 2^663975432 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 663975432, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (917738640).

663975432 is an abundant number, since it is smaller than the sum of its proper divisors (1171501848).

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

663975432 is a wasteful number, since it uses less digits than its factorization.

663975432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1043 (or 1036 counting only the distinct ones).

The product of its digits is 816480, while the sum is 45.

The square root of 663975432 is about 25767.7207373877. The cubic root of 663975432 is about 872.4033743839.

The spelling of 663975432 in words is "six hundred sixty-three million, nine hundred seventy-five thousand, four hundred thirty-two".