31428656928 has 72 divisors (see below), whose sum is σ = 91555161516. Its totient is φ = 10220697600.

The previous prime is 31428656927. The next prime is 31428656947. The reversal of 31428656928 is 82965682413.

31428656928 is a `hidden beast` number, since 31 + 4 + 28 + 6 + 569 + 28 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 30606802704 + 821854224 = 174948^2 + 28668^2 .

It is a tau number, because it is divible by the number of its divisors (72).

It is not an unprimeable number, because it can be changed into a prime (31428656923) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1319013 + ... + 1342628.

Almost surely, 2^31428656928 is an apocalyptic number.

It is an amenable number.

31428656928 is an abundant number, since it is smaller than the sum of its proper divisors (60126504588).

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

31428656928 is a wasteful number, since it uses less digits than its factorization.

31428656928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2661698 (or 2661687 counting only the distinct ones).

The product of its digits is 4976640, while the sum is 54.

The spelling of 31428656928 in words is "thirty-one billion, four hundred twenty-eight million, six hundred fifty-six thousand, nine hundred twenty-eight".