31232144440 has 32 divisors (see below), whose sum is σ = 80311229280. Its totient is φ = 10708163712.

The previous prime is 31232144423. The next prime is 31232144459. The reversal of 31232144440 is 4444123213.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a junction number, because it is equal to n+sod(n) for n = 31232144399 and 31232144408.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 55771407 + ... + 55771966.

It is an arithmetic number, because the mean of its divisors is an integer number (2509725915).

Almost surely, 2^31232144440 is an apocalyptic number.

It is an amenable number.

31232144440 is an abundant number, since it is smaller than the sum of its proper divisors (49079084840).

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

31232144440 is a wasteful number, since it uses less digits than its factorization.

31232144440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111543391 (or 111543387 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 28.

Adding to 31232144440 its reverse (4444123213), we get a palindrome (35676267653).

The spelling of 31232144440 in words is "thirty-one billion, two hundred thirty-two million, one hundred forty-four thousand, four hundred forty".