28726790565 has 64 divisors (see below), whose sum is σ = 53272546560. Its totient is φ = 13084323840.

The previous prime is 28726790551. The next prime is 28726790627. The reversal of 28726790565 is 56509762782.

It is not a de Polignac number, because 28726790565 - 2⁶ = 28726790501 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 95917 + ... + 258173.

It is an arithmetic number, because the mean of its divisors is an integer number (832383540).

Almost surely, 2^28726790565 is an apocalyptic number.

It is an amenable number.

28726790565 is a deficient number, since it is larger than the sum of its proper divisors (24545755995).

28726790565 is a wasteful number, since it uses less digits than its factorization.

28726790565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162342.

The product of its (nonzero) digits is 12700800, while the sum is 57.

The spelling of 28726790565 in words is "twenty-eight billion, seven hundred twenty-six million, seven hundred ninety thousand, five hundred sixty-five".