13578528638 has 16 divisors (see below), whose sum is σ = 21443154000. Its totient is φ = 6430923072.

The previous prime is 13578528631. The next prime is 13578528647. The reversal of 13578528638 is 83682587531.

It is a super-2 number, since 2×13578528638² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13578528631) 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, 253298 + ... + 302186.

It is an arithmetic number, because the mean of its divisors is an integer number (1340197125).

Almost surely, 2^13578528638 is an apocalyptic number.

13578528638 is a deficient number, since it is larger than the sum of its proper divisors (7864625362).

13578528638 is a wasteful number, since it uses less digits than its factorization.

13578528638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56219.

The product of its digits is 9676800, while the sum is 56.

The spelling of 13578528638 in words is "thirteen billion, five hundred seventy-eight million, five hundred twenty-eight thousand, six hundred thirty-eight".