28255027578 has 32 divisors (see below), whose sum is σ = 58101477120. Its totient is φ = 9153668160.

The previous prime is 28255027453. The next prime is 28255027579. The reversal of 28255027578 is 87572055282.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 28255027578.

It is not an unprimeable number, because it can be changed into a prime (28255027579) 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, 132388 + ... + 272096.

It is an arithmetic number, because the mean of its divisors is an integer number (1815671160).

Almost surely, 2^28255027578 is an apocalyptic number.

28255027578 is an abundant number, since it is smaller than the sum of its proper divisors (29846449542).

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

28255027578 is a wasteful number, since it uses less digits than its factorization.

28255027578 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140662.

The product of its (nonzero) digits is 3136000, while the sum is 51.

The spelling of 28255027578 in words is "twenty-eight billion, two hundred fifty-five million, twenty-seven thousand, five hundred seventy-eight".