28505777575 has 24 divisors (see below), whose sum is σ = 39103675776. Its totient is φ = 20439468000.

The previous prime is 28505777561. The next prime is 28505777591. The reversal of 28505777575 is 57577750582.

It is not a de Polignac number, because 28505777575 - 2²⁹ = 27968906663 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, 710457 + ... + 749506.

It is an arithmetic number, because the mean of its divisors is an integer number (1629319824).

Almost surely, 2^28505777575 is an apocalyptic number.

28505777575 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

28505777575 is a deficient number, since it is larger than the sum of its proper divisors (10597898201).

28505777575 is a wasteful number, since it uses less digits than its factorization.

28505777575 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1460055 (or 1460050 counting only the distinct ones).

The product of its (nonzero) digits is 24010000, while the sum is 58.

The spelling of 28505777575 in words is "twenty-eight billion, five hundred five million, seven hundred seventy-seven thousand, five hundred seventy-five".