663231400 has 96 divisors (see below), whose sum is σ = 1692313560. Its totient is φ = 240215040.

The previous prime is 663231383. The next prime is 663231407. The reversal of 663231400 is 4132366.

It can be written as a sum of positive squares in 12 ways, for example, as 57972996 + 605258404 = 7614^2 + 24602^2 .

It is a Harshad number since it is a multiple of its sum of digits (25).

It is not an unprimeable number, because it can be changed into a prime (663231407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 135394 + ... + 140206.

Almost surely, 2^663231400 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 663231400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (846156780).

663231400 is an abundant number, since it is smaller than the sum of its proper divisors (1029082160).

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

663231400 is a wasteful number, since it uses less digits than its factorization.

663231400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4895 (or 4886 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 25.

The square root of 663231400 is about 25753.2794028256. The cubic root of 663231400 is about 872.0773891140.

Adding to 663231400 its reverse (4132366), we get a palindrome (667363766).

The spelling of 663231400 in words is "six hundred sixty-three million, two hundred thirty-one thousand, four hundred".