28057730526 has 96 divisors (see below), whose sum is σ = 70876435968. Its totient is φ = 7855323840.

The previous prime is 28057730507. The next prime is 28057730527. The reversal of 28057730526 is 62503775082.

28057730526 is a `hidden beast` number, since 2 + 8 + 0 + 57 + 73 + 0 + 526 = 666.

It is a super-3 number, since 3×28057730526³ (a number of 32 digits) contains 333 as substring.

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 47 ways as a sum of consecutive naturals, for example, 6482175 + ... + 6486501.

It is an arithmetic number, because the mean of its divisors is an integer number (738296208).

Almost surely, 2^28057730526 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28057730526, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35438217984).

28057730526 is an abundant number, since it is smaller than the sum of its proper divisors (42818705442).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28057730526 is a wasteful number, since it uses less digits than its factorization.

28057730526 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5366 (or 5363 counting only the distinct ones).

The product of its (nonzero) digits is 705600, while the sum is 45.

The spelling of 28057730526 in words is "twenty-eight billion, fifty-seven million, seven hundred thirty thousand, five hundred twenty-six".