28578225870 has 128 divisors (see below), whose sum is σ = 80758270080. Its totient is φ = 7166638080.

The previous prime is 28578225821. The next prime is 28578225889. The reversal of 28578225870 is 7852287582.

28578225870 is a `hidden beast` number, since 2 + 8 + 57 + 8 + 2 + 2 + 587 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 8870860 + ... + 8874080.

It is an arithmetic number, because the mean of its divisors is an integer number (630923985).

Almost surely, 2^28578225870 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28578225870, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40379135040).

28578225870 is an abundant number, since it is smaller than the sum of its proper divisors (52180044210).

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

28578225870 is a wasteful number, since it uses less digits than its factorization.

28578225870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5187 (or 5181 counting only the distinct ones).

The product of its (nonzero) digits is 5017600, while the sum is 54.

The spelling of 28578225870 in words is "twenty-eight billion, five hundred seventy-eight million, two hundred twenty-five thousand, eight hundred seventy".