31184478428 has 48 divisors (see below), whose sum is σ = 58634160480. Its totient is φ = 14459295744.

The previous prime is 31184478421. The next prime is 31184478443. The reversal of 31184478428 is 82487448113.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31184478421) 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, 6018743 + ... + 6023921.

It is an arithmetic number, because the mean of its divisors is an integer number (1221545010).

Almost surely, 2^31184478428 is an apocalyptic number.

It is an amenable number.

31184478428 is a deficient number, since it is larger than the sum of its proper divisors (27449682052).

31184478428 is a wasteful number, since it uses less digits than its factorization.

31184478428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6486 (or 6484 counting only the distinct ones).

The product of its digits is 1376256, while the sum is 50.

The spelling of 31184478428 in words is "thirty-one billion, one hundred eighty-four million, four hundred seventy-eight thousand, four hundred twenty-eight".