31017728422856 has 128 divisors (see below), whose sum is σ = 71187934752000. Its totient is φ = 12367154798592.

The previous prime is 31017728422847. The next prime is 31017728422903. The reversal of 31017728422856 is 65822482771013.

It is a happy number.

It is a super-2 number, since 2×31017728422856² (a number of 28 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (56).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 299292215 + ... + 299395833.

It is an arithmetic number, because the mean of its divisors is an integer number (556155740250).

Almost surely, 2^{31017728422856} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31017728422856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35593967376000).

31017728422856 is an abundant number, since it is smaller than the sum of its proper divisors (40170206329144).

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

31017728422856 is a wasteful number, since it uses less digits than its factorization.

31017728422856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107271 (or 107267 counting only the distinct ones).

The product of its (nonzero) digits is 9031680, while the sum is 56.

The spelling of 31017728422856 in words is "thirty-one trillion, seventeen billion, seven hundred twenty-eight million, four hundred twenty-two thousand, eight hundred fifty-six".