31871978470 has 16 divisors (see below), whose sum is σ = 57520938960. Its totient is φ = 12715151904.

The previous prime is 31871978461. The next prime is 31871978473. The reversal of 31871978470 is 7487917813.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31871978473) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4200957 + ... + 4208536.

It is an arithmetic number, because the mean of its divisors is an integer number (3595058685).

Almost surely, 2^31871978470 is an apocalyptic number.

31871978470 is a deficient number, since it is larger than the sum of its proper divisors (25648960490).

31871978470 is a wasteful number, since it uses less digits than its factorization.

31871978470 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8409879.

The product of its (nonzero) digits is 2370816, while the sum is 55.

The spelling of 31871978470 in words is "thirty-one billion, eight hundred seventy-one million, nine hundred seventy-eight thousand, four hundred seventy".