31284378447 has 24 divisors (see below), whose sum is σ = 48675850416. Its totient is φ = 17820367488.

The previous prime is 31284378403. The next prime is 31284378457. The reversal of 31284378447 is 74487348213.

It is not a de Polignac number, because 31284378447 - 2⁶ = 31284378383 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31284378447.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31284378457) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 289078 + ... + 382275.

It is an arithmetic number, because the mean of its divisors is an integer number (2028160434).

Almost surely, 2^31284378447 is an apocalyptic number.

31284378447 is a deficient number, since it is larger than the sum of its proper divisors (17391471969).

31284378447 is a wasteful number, since it uses less digits than its factorization.

31284378447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 671687 (or 671680 counting only the distinct ones).

The product of its digits is 3612672, while the sum is 51.

The spelling of 31284378447 in words is "thirty-one billion, two hundred eighty-four million, three hundred seventy-eight thousand, four hundred forty-seven".