31478254728 has 16 divisors (see below), whose sum is σ = 78695636880. Its totient is φ = 10492751568.

The previous prime is 31478254721. The next prime is 31478254741. The reversal of 31478254728 is 82745287413.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (31478254721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 655796950 + ... + 655796997.

It is an arithmetic number, because the mean of its divisors is an integer number (4918477305).

Almost surely, 2^31478254728 is an apocalyptic number.

It is an amenable number.

31478254728 is an abundant number, since it is smaller than the sum of its proper divisors (47217382152).

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

31478254728 is a wasteful number, since it uses less digits than its factorization.

31478254728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1311593956 (or 1311593952 counting only the distinct ones).

The product of its digits is 3010560, while the sum is 51.

The spelling of 31478254728 in words is "thirty-one billion, four hundred seventy-eight million, two hundred fifty-four thousand, seven hundred twenty-eight".