31284378438 has 16 divisors (see below), whose sum is σ = 64587104256. Its totient is φ = 10091734920.

The previous prime is 31284378403. The next prime is 31284378457. The reversal of 31284378438 is 83487348213.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 84097606 + ... + 84097977.

It is an arithmetic number, because the mean of its divisors is an integer number (4036694016).

Almost surely, 2^31284378438 is an apocalyptic number.

31284378438 is an abundant number, since it is smaller than the sum of its proper divisors (33302725818).

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

31284378438 is a wasteful number, since it uses less digits than its factorization.

31284378438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168195619.

The product of its digits is 3096576, while the sum is 51.

The spelling of 31284378438 in words is "thirty-one billion, two hundred eighty-four million, three hundred seventy-eight thousand, four hundred thirty-eight".