28057730525 has 24 divisors (see below), whose sum is σ = 37962228000. Its totient is φ = 20401444800.

The previous prime is 28057730507. The next prime is 28057730527. The reversal of 28057730525 is 52503775082.

It is not a de Polignac number, because 28057730525 - 2¹² = 28057726429 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28057730527) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2135426 + ... + 2148524.

It is an arithmetic number, because the mean of its divisors is an integer number (1581759500).

Almost surely, 2^28057730525 is an apocalyptic number.

28057730525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28057730525 is a deficient number, since it is larger than the sum of its proper divisors (9904497475).

28057730525 is a wasteful number, since it uses less digits than its factorization.

28057730525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20909 (or 20904 counting only the distinct ones).

The product of its (nonzero) digits is 588000, while the sum is 44.

The spelling of 28057730525 in words is "twenty-eight billion, fifty-seven million, seven hundred thirty thousand, five hundred twenty-five".