13685278438 has 32 divisors (see below), whose sum is σ = 23119992000. Its totient is φ = 6028087296.

The previous prime is 13685278421. The next prime is 13685278457. The reversal of 13685278438 is 83487258631.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 243018 + ... + 293986.

It is an arithmetic number, because the mean of its divisors is an integer number (722499750).

Almost surely, 2^13685278438 is an apocalyptic number.

13685278438 is a deficient number, since it is larger than the sum of its proper divisors (9434713562).

13685278438 is a wasteful number, since it uses less digits than its factorization.

13685278438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51456.

The product of its digits is 7741440, while the sum is 55.

The spelling of 13685278438 in words is "thirteen billion, six hundred eighty-five million, two hundred seventy-eight thousand, four hundred thirty-eight".