28938494565 has 24 divisors (see below), whose sum is σ = 52017839328. Its totient is φ = 15433863120.

The previous prime is 28938494551. The next prime is 28938494587. The reversal of 28938494565 is 56549483982.

28938494565 is a `hidden beast` number, since 2 + 8 + 93 + 8 + 494 + 56 + 5 = 666.

It is not a de Polignac number, because 28938494565 - 2¹⁰ = 28938493541 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11907631 + ... + 11910060.

It is an arithmetic number, because the mean of its divisors is an integer number (2167409972).

Almost surely, 2^28938494565 is an apocalyptic number.

It is an amenable number.

28938494565 is a deficient number, since it is larger than the sum of its proper divisors (23079344763).

28938494565 is an equidigital number, since it uses as much as digits as its factorization.

28938494565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23817711 (or 23817699 counting only the distinct ones).

The product of its digits is 74649600, while the sum is 63.

The spelling of 28938494565 in words is "twenty-eight billion, nine hundred thirty-eight million, four hundred ninety-four thousand, five hundred sixty-five".