28668781545 has 32 divisors (see below), whose sum is σ = 46079649792. Its totient is φ = 15220266432.

The previous prime is 28668781513. The next prime is 28668781597. The reversal of 28668781545 is 54518786682.

It is not a de Polignac number, because 28668781545 - 2⁵ = 28668781513 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4934032 + ... + 4939838.

It is an arithmetic number, because the mean of its divisors is an integer number (1439989056).

Almost surely, 2^28668781545 is an apocalyptic number.

It is an amenable number.

28668781545 is a deficient number, since it is larger than the sum of its proper divisors (17410868247).

28668781545 is a wasteful number, since it uses less digits than its factorization.

28668781545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7261.

The product of its digits is 25804800, while the sum is 60.

The spelling of 28668781545 in words is "twenty-eight billion, six hundred sixty-eight million, seven hundred eighty-one thousand, five hundred forty-five".