31443983890 has 32 divisors (see below), whose sum is σ = 61753829760. Its totient is φ = 11432457600.

The previous prime is 31443983881. The next prime is 31443983897. The reversal of 31443983890 is 9838934413.

It is not an unprimeable number, because it can be changed into a prime (31443983897) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 888046 + ... + 922774.

It is an arithmetic number, because the mean of its divisors is an integer number (1929807180).

Almost surely, 2^31443983890 is an apocalyptic number.

31443983890 is a deficient number, since it is larger than the sum of its proper divisors (30309845870).

31443983890 is a wasteful number, since it uses less digits than its factorization.

31443983890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42978.

The product of its (nonzero) digits is 2239488, while the sum is 52.

The spelling of 31443983890 in words is "thirty-one billion, four hundred forty-three million, nine hundred eighty-three thousand, eight hundred ninety".