28507743616 has 32 divisors (see below), whose sum is σ = 61955752680. Its totient is φ = 12958064640.

The previous prime is 28507743611. The next prime is 28507743709. The reversal of 28507743616 is 61634770582.

It is a tau number, because it is divible by the number of its divisors (32).

It is a self number, because there is not a number n which added to its sum of digits gives 28507743616.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28507743611) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10122081 + ... + 10124896.

Almost surely, 2^28507743616 is an apocalyptic number.

It is an amenable number.

28507743616 is an abundant number, since it is smaller than the sum of its proper divisors (33448009064).

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

28507743616 is a wasteful number, since it uses less digits than its factorization.

28507743616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20247002 (or 20246990 counting only the distinct ones).

The product of its (nonzero) digits is 1693440, while the sum is 49.

The spelling of 28507743616 in words is "twenty-eight billion, five hundred seven million, seven hundred forty-three thousand, six hundred sixteen".