31743381978 has 96 divisors (see below), whose sum is σ = 89517597120. Its totient is φ = 8245026720.

The previous prime is 31743381913. The next prime is 31743381979. The reversal of 31743381978 is 87918334713.

31743381978 is a `hidden beast` number, since 3 + 17 + 433 + 8 + 197 + 8 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (31743381979) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 516201 + ... + 574412.

It is an arithmetic number, because the mean of its divisors is an integer number (932474970).

Almost surely, 2^31743381978 is an apocalyptic number.

31743381978 is an abundant number, since it is smaller than the sum of its proper divisors (57774215142).

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

31743381978 is a wasteful number, since it uses less digits than its factorization.

31743381978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1090649 (or 1090636 counting only the distinct ones).

The product of its digits is 3048192, while the sum is 54.

The spelling of 31743381978 in words is "thirty-one billion, seven hundred forty-three million, three hundred eighty-one thousand, nine hundred seventy-eight".