663404250 has 64 divisors (see below), whose sum is σ = 1663234560. Its totient is φ = 176120000.

The previous prime is 663404239. The next prime is 663404257. The reversal of 663404250 is 52404366.

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

It is not an unprimeable number, because it can be changed into a prime (663404257) 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, 177400 + ... + 181100.

It is an arithmetic number, because the mean of its divisors is an integer number (25988040).

Almost surely, 2^663404250 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 663404250, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (831617280).

663404250 is an abundant number, since it is smaller than the sum of its proper divisors (999830310).

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

663404250 is a wasteful number, since it uses less digits than its factorization.

663404250 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3960 (or 3950 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 30.

The square root of 663404250 is about 25756.6350674928. The cubic root of 663404250 is about 872.1531422038.

The spelling of 663404250 in words is "six hundred sixty-three million, four hundred four thousand, two hundred fifty".