31201778712 has 128 divisors (see below), whose sum is σ = 85331957760. Its totient is φ = 9449341440.

The previous prime is 31201778711. The next prime is 31201778731. The reversal of 31201778712 is 21787710213.

It is a hoax number, since the sum of its digits (39) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31201778711) 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, 24433018 + ... + 24434294.

It is an arithmetic number, because the mean of its divisors is an integer number (666655920).

Almost surely, 2^31201778712 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 31201778712, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42665978880).

31201778712 is an abundant number, since it is smaller than the sum of its proper divisors (54130179048).

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

31201778712 is a wasteful number, since it uses less digits than its factorization.

31201778712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2473 (or 2469 counting only the distinct ones).

The product of its (nonzero) digits is 32928, while the sum is 39.

The spelling of 31201778712 in words is "thirty-one billion, two hundred one million, seven hundred seventy-eight thousand, seven hundred twelve".