31706479780 has 12 divisors (see below), whose sum is σ = 66583607580. Its totient is φ = 12682591904.

The previous prime is 31706479771. The next prime is 31706479789. The reversal of 31706479780 is 8797460713.

It is an interprime number because it is at equal distance from previous prime (31706479771) and next prime (31706479789).

It can be written as a sum of positive squares in 2 ways, for example, as 22964977764 + 8741502016 = 151542^2 + 93496^2 .

It is not an unprimeable number, because it can be changed into a prime (31706479789) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 792661975 + ... + 792662014.

It is an arithmetic number, because the mean of its divisors is an integer number (5548633965).

Almost surely, 2^31706479780 is an apocalyptic number.

It is an amenable number.

31706479780 is an abundant number, since it is smaller than the sum of its proper divisors (34877127800).

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

31706479780 is a wasteful number, since it uses less digits than its factorization.

31706479780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1585323998 (or 1585323996 counting only the distinct ones).

The product of its (nonzero) digits is 1778112, while the sum is 52.

The spelling of 31706479780 in words is "thirty-one billion, seven hundred six million, four hundred seventy-nine thousand, seven hundred eighty".