28135607525 has 12 divisors (see below), whose sum is σ = 35831077572. Its totient is φ = 21900147840.

The previous prime is 28135607503. The next prime is 28135607537. The reversal of 28135607525 is 52570653182.

It can be written as a sum of positive squares in 6 ways, for example, as 1194324481 + 26941283044 = 34559^2 + 164138^2 .

It is not a de Polignac number, because 28135607525 - 2¹⁶ = 28135541989 is a prime.

It is a super-2 number, since 2×28135607525² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

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, 15207512 + ... + 15209361.

It is an arithmetic number, because the mean of its divisors is an integer number (2985923131).

Almost surely, 2^28135607525 is an apocalyptic number.

28135607525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28135607525 is a deficient number, since it is larger than the sum of its proper divisors (7695470047).

28135607525 is a wasteful number, since it uses less digits than its factorization.

28135607525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30416920 (or 30416915 counting only the distinct ones).

The product of its (nonzero) digits is 504000, while the sum is 44.

The spelling of 28135607525 in words is "twenty-eight billion, one hundred thirty-five million, six hundred seven thousand, five hundred twenty-five".