31878416385 has 48 divisors (see below), whose sum is σ = 55913876928. Its totient is φ = 16800048000.

The previous prime is 31878416363. The next prime is 31878416387. The reversal of 31878416385 is 58361487813.

It is a happy number.

31878416385 is a `hidden beast` number, since 3 + 187 + 84 + 1 + 6 + 385 = 666.

It is not a de Polignac number, because 31878416385 - 2⁶ = 31878416321 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31878416387) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2370330 + ... + 2383740.

It is an arithmetic number, because the mean of its divisors is an integer number (1164872436).

Almost surely, 2^31878416385 is an apocalyptic number.

It is an amenable number.

31878416385 is a deficient number, since it is larger than the sum of its proper divisors (24035460543).

31878416385 is a wasteful number, since it uses less digits than its factorization.

31878416385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14046 (or 14043 counting only the distinct ones).

The product of its digits is 3870720, while the sum is 54.

The spelling of 31878416385 in words is "thirty-one billion, eight hundred seventy-eight million, four hundred sixteen thousand, three hundred eighty-five".