31000232400 has 60 divisors (see below), whose sum is σ = 99304081632. Its totient is φ = 8266728320.

The previous prime is 31000232383. The next prime is 31000232437. The reversal of 31000232400 is 423200013.

It is a tau number, because it is divible by the number of its divisors (60).

It is a super-2 number, since 2×31000232400² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 31000232400.

It is a congruent number.

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, 12915564 + ... + 12917963.

Almost surely, 2^31000232400 is an apocalyptic number.

31000232400 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31000232400 is an abundant number, since it is smaller than the sum of its proper divisors (68303849232).

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

31000232400 is a wasteful number, since it uses less digits than its factorization.

31000232400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25833548 (or 25833537 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 15.

Adding to 31000232400 its reverse (423200013), we get a palindrome (31423432413).

The spelling of 31000232400 in words is "thirty-one billion, two hundred thirty-two thousand, four hundred".