31443668 has 24 divisors (see below), whose sum is σ = 57879360. Its totient is φ = 14917760.

The previous prime is 31443661. The next prime is 31443721. The reversal of 31443668 is 86634413.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31443661) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10748 + ... + 13356.

It is an arithmetic number, because the mean of its divisors is an integer number (2411640).

Almost surely, 2^31443668 is an apocalyptic number.

It is an amenable number.

31443668 is a deficient number, since it is larger than the sum of its proper divisors (26435692).

31443668 is a wasteful number, since it uses less digits than its factorization.

31443668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2767 (or 2765 counting only the distinct ones).

The product of its digits is 41472, while the sum is 35.

The square root of 31443668 is about 5607.4653810790. The cubic root of 31443668 is about 315.6296066118.

The spelling of 31443668 in words is "thirty-one million, four hundred forty-three thousand, six hundred sixty-eight".