28135532448 has 36 divisors (see below), whose sum is σ = 80010421218. Its totient is φ = 9378510720.

The previous prime is 28135532413. The next prime is 28135532471. The reversal of 28135532448 is 84423553182.

28135532448 is a `hidden beast` number, since 2 + 81 + 35 + 532 + 4 + 4 + 8 = 666.

It can be written as a sum of positive squares in only one way, i.e., 20463874704 + 7671657744 = 143052^2 + 87588^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×28135532448² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 48846123 + ... + 48846698.

Almost surely, 2^28135532448 is an apocalyptic number.

It is an amenable number.

28135532448 is an abundant number, since it is smaller than the sum of its proper divisors (51874888770).

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

28135532448 is a wasteful number, since it uses less digits than its factorization.

28135532448 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97692837 (or 97692826 counting only the distinct ones).

The product of its digits is 921600, while the sum is 45.

The spelling of 28135532448 in words is "twenty-eight billion, one hundred thirty-five million, five hundred thirty-two thousand, four hundred forty-eight".