31285493856 has 216 divisors, whose sum is σ = 97073252640. Its totient is φ = 9548845056.

The previous prime is 31285493821. The next prime is 31285493891. The reversal of 31285493856 is 65839458213.

31285493856 is a `hidden beast` number, since 3 + 12 + 8 + 549 + 3 + 85 + 6 = 666.

It is an interprime number because it is at equal distance from previous prime (31285493821) and next prime (31285493891).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 3074505 + ... + 3084663.

Almost surely, 2^31285493856 is an apocalyptic number.

31285493856 is a gapful number since it is divisible by the number (36) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31285493856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (48536626320).

31285493856 is an abundant number, since it is smaller than the sum of its proper divisors (65787758784).

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

31285493856 is a wasteful number, since it uses less digits than its factorization.

31285493856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10246 (or 10218 counting only the distinct ones).

The product of its digits is 6220800, while the sum is 54.

The spelling of 31285493856 in words is "thirty-one billion, two hundred eighty-five million, four hundred ninety-three thousand, eight hundred fifty-six".