28668781542 has 16 divisors (see below), whose sum is σ = 57339875952. Its totient is φ = 9555875040.

The previous prime is 28668781513. The next prime is 28668781597. The reversal of 28668781542 is 24518786682.

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, 93568 + ... + 257084.

It is an arithmetic number, because the mean of its divisors is an integer number (3583742247).

Almost surely, 2^28668781542 is an apocalyptic number.

28668781542 is an abundant number, since it is smaller than the sum of its proper divisors (28671094410).

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

28668781542 is a wasteful number, since it uses less digits than its factorization.

28668781542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 192743.

The product of its digits is 10321920, while the sum is 57.

The spelling of 28668781542 in words is "twenty-eight billion, six hundred sixty-eight million, seven hundred eighty-one thousand, five hundred forty-two".