31368782874 has 128 divisors (see below), whose sum is σ = 79366210560. Its totient is φ = 8118144000.

The previous prime is 31368782873. The next prime is 31368782881. The reversal of 31368782874 is 47828786313.

It is a happy number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (31368782873) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 842349 + ... + 878799.

It is an arithmetic number, because the mean of its divisors is an integer number (620048520).

Almost surely, 2^31368782874 is an apocalyptic number.

31368782874 is a gapful number since it is divisible by the number (34) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 31368782874, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39683105280).

31368782874 is an abundant number, since it is smaller than the sum of its proper divisors (47997427686).

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

31368782874 is a wasteful number, since it uses less digits than its factorization.

31368782874 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36556.

The product of its digits is 10838016, while the sum is 57.

The spelling of 31368782874 in words is "thirty-one billion, three hundred sixty-eight million, seven hundred eighty-two thousand, eight hundred seventy-four".