231223242400 has 72 divisors (see below), whose sum is σ = 597678113340. Its totient is φ = 87048744960.

The previous prime is 231223242379. The next prime is 231223242431. The reversal of 231223242400 is 4242322132.

It can be written as a sum of positive squares in 6 ways, for example, as 145835389456 + 85387852944 = 381884^2 + 292212^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8487255 + ... + 8514454.

Almost surely, 2^231223242400 is an apocalyptic number.

231223242400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

231223242400 is an abundant number, since it is smaller than the sum of its proper divisors (366454870940).

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

231223242400 is a wasteful number, since it uses less digits than its factorization.

231223242400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17001746 (or 17001733 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 25.

Adding to 231223242400 its reverse (4242322132), we get a palindrome (235465564532).

The spelling of 231223242400 in words is "two hundred thirty-one billion, two hundred twenty-three million, two hundred forty-two thousand, four hundred".