28765195506 has 24 divisors (see below), whose sum is σ = 62344758060. Its totient is φ = 9585295776.

The previous prime is 28765195471. The next prime is 28765195517. The reversal of 28765195506 is 60559156782.

28765195506 is a `hidden beast` number, since 2 + 8 + 76 + 5 + 19 + 550 + 6 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 28524169881 + 241025625 = 168891^2 + 15525^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 201045 + ... + 312968.

Almost surely, 2^28765195506 is an apocalyptic number.

28765195506 is an abundant number, since it is smaller than the sum of its proper divisors (33579562554).

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

28765195506 is a wasteful number, since it uses less digits than its factorization.

28765195506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 517130 (or 517127 counting only the distinct ones).

The product of its (nonzero) digits is 4536000, while the sum is 54.

The spelling of 28765195506 in words is "twenty-eight billion, seven hundred sixty-five million, one hundred ninety-five thousand, five hundred six".