28005378912 has 96 divisors (see below), whose sum is σ = 93351283200. Its totient is φ = 8001535104.

The previous prime is 28005378811. The next prime is 28005378913. The reversal of 28005378912 is 21987350082.

It is a happy number.

28005378912 is a `hidden beast` number, since 28 + 0 + 0 + 537 + 8 + 91 + 2 = 666.

It is a tau number, because it is divible by the number of its divisors (96).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28005378913) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2309212 + ... + 2321307.

It is an arithmetic number, because the mean of its divisors is an integer number (972409200).

Almost surely, 2^28005378912 is an apocalyptic number.

It is an amenable number.

28005378912 is an abundant number, since it is smaller than the sum of its proper divisors (65345904288).

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

28005378912 is a wasteful number, since it uses less digits than its factorization.

28005378912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4630545 (or 4630531 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 45.

The spelling of 28005378912 in words is "twenty-eight billion, five million, three hundred seventy-eight thousand, nine hundred twelve".