31020443428 has 12 divisors (see below), whose sum is σ = 58461605020. Its totient is φ = 14317127712.

The previous prime is 31020443411. The next prime is 31020443429. The reversal of 31020443428 is 82434402013.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 18922203364 + 12098240064 = 137558^2 + 109992^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 31020443428.

It is not an unprimeable number, because it can be changed into a prime (31020443429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 298273443 + ... + 298273546.

Almost surely, 2^31020443428 is an apocalyptic number.

It is an amenable number.

31020443428 is a deficient number, since it is larger than the sum of its proper divisors (27441161592).

31020443428 is a wasteful number, since it uses less digits than its factorization.

31020443428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 596547006 (or 596547004 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 31.

The spelling of 31020443428 in words is "thirty-one billion, twenty million, four hundred forty-three thousand, four hundred twenty-eight".