13887864528 has 80 divisors (see below), whose sum is σ = 36481284096. Its totient is φ = 4551966720.

The previous prime is 13887864521. The next prime is 13887864533. The reversal of 13887864528 is 82546878831.

It is a super-2 number, since 2×13887864528² (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 (13887864521) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 678768 + ... + 698928.

Almost surely, 2^13887864528 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 13887864528, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18240642048).

13887864528 is an abundant number, since it is smaller than the sum of its proper divisors (22593419568).

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

13887864528 is a wasteful number, since it uses less digits than its factorization.

13887864528 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20412 (or 20406 counting only the distinct ones).

The product of its digits is 20643840, while the sum is 60.

The spelling of 13887864528 in words is "thirteen billion, eight hundred eighty-seven million, eight hundred sixty-four thousand, five hundred twenty-eight".