31020173028 has 36 divisors (see below), whose sum is σ = 84443805628. Its totient is φ = 9544668480.

The previous prime is 31020173027. The next prime is 31020173081. The reversal of 31020173028 is 82037102013.

It can be written as a sum of positive squares in 2 ways, for example, as 3423654144 + 27596518884 = 58512^2 + 166122^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×31020173028² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31020172992 and 31020173010.

It is not an unprimeable number, because it can be changed into a prime (31020173027) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 33140743 + ... + 33141678.

Almost surely, 2^31020173028 is an apocalyptic number.

It is an amenable number.

31020173028 is an abundant number, since it is smaller than the sum of its proper divisors (53423632600).

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

31020173028 is a wasteful number, since it uses less digits than its factorization.

31020173028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66282444 (or 66282439 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The spelling of 31020173028 in words is "thirty-one billion, twenty million, one hundred seventy-three thousand, twenty-eight".