28525398566 has 32 divisors (see below), whose sum is σ = 51390324480. Its totient is φ = 11618129376.

The previous prime is 28525398553. The next prime is 28525398607. The reversal of 28525398566 is 66589352582.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 618056 + ... + 662603.

It is an arithmetic number, because the mean of its divisors is an integer number (1605947640).

Almost surely, 2^28525398566 is an apocalyptic number.

28525398566 is a deficient number, since it is larger than the sum of its proper divisors (22864925914).

28525398566 is a wasteful number, since it uses less digits than its factorization.

28525398566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1280748.

The product of its digits is 31104000, while the sum is 59.

The spelling of 28525398566 in words is "twenty-eight billion, five hundred twenty-five million, three hundred ninety-eight thousand, five hundred sixty-six".