31786061440 has 256 divisors, whose sum is σ = 92248865280. Its totient is φ = 10224009216.

The previous prime is 31786061429. The next prime is 31786061441. The reversal of 31786061440 is 4416068713.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 31786061393 and 31786061402.

It is not an unprimeable number, because it can be changed into a prime (31786061441) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 37089492 + ... + 37090348.

It is an arithmetic number, because the mean of its divisors is an integer number (360347130).

Almost surely, 2^31786061440 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 31786061440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (46124432640).

31786061440 is an abundant number, since it is smaller than the sum of its proper divisors (60462803840).

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

31786061440 is a wasteful number, since it uses less digits than its factorization.

31786061440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1387 (or 1375 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 40.

The spelling of 31786061440 in words is "thirty-one billion, seven hundred eighty-six million, sixty-one thousand, four hundred forty".