28135294632 has 24 divisors (see below), whose sum is σ = 76199756490. Its totient is φ = 9378431520.

The previous prime is 28135294553. The next prime is 28135294633. The reversal of 28135294632 is 23649253182.

28135294632 is a `hidden beast` number, since 2 + 8 + 1 + 3 + 5 + 2 + 9 + 4 + 632 = 666.

It can be written as a sum of positive squares in only one way, i.e., 15531639876 + 12603654756 = 124626^2 + 112266^2 .

It is a tau number, because it is divible by the number of its divisors (24).

It is not an unprimeable number, because it can be changed into a prime (28135294633) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 195383919 + ... + 195384062.

Almost surely, 2^28135294632 is an apocalyptic number.

It is an amenable number.

28135294632 is an abundant number, since it is smaller than the sum of its proper divisors (48064461858).

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

28135294632 is a wasteful number, since it uses less digits than its factorization.

28135294632 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 390767993 (or 390767986 counting only the distinct ones).

The product of its digits is 622080, while the sum is 45.

The spelling of 28135294632 in words is "twenty-eight billion, one hundred thirty-five million, two hundred ninety-four thousand, six hundred thirty-two".