31280216785 has 16 divisors (see below), whose sum is σ = 38836923840. Its totient is φ = 24157344960.

The previous prime is 31280216777. The next prime is 31280216831. The reversal of 31280216785 is 58761208213.

It is not a de Polignac number, because 31280216785 - 2³ = 31280216777 is a prime.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 1141090 + ... + 1168180.

It is an arithmetic number, because the mean of its divisors is an integer number (2427307740).

Almost surely, 2^31280216785 is an apocalyptic number.

It is an amenable number.

31280216785 is a deficient number, since it is larger than the sum of its proper divisors (7556707055).

31280216785 is a wasteful number, since it uses less digits than its factorization.

31280216785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35088.

The product of its (nonzero) digits is 161280, while the sum is 43.

The spelling of 31280216785 in words is "thirty-one billion, two hundred eighty million, two hundred sixteen thousand, seven hundred eighty-five".