28282557420 has 144 divisors (see below), whose sum is σ = 93956073120. Its totient is φ = 6843829248.

The previous prime is 28282557379. The next prime is 28282557437. The reversal of 28282557420 is 2475528282.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 35632 + ... + 240488.

It is an arithmetic number, because the mean of its divisors is an integer number (652472730).

Almost surely, 2^28282557420 is an apocalyptic number.

28282557420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28282557420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (46978036560).

28282557420 is an abundant number, since it is smaller than the sum of its proper divisors (65673515700).

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

28282557420 is a wasteful number, since it uses less digits than its factorization.

28282557420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 204944 (or 204939 counting only the distinct ones).

The product of its (nonzero) digits is 716800, while the sum is 45.

The spelling of 28282557420 in words is "twenty-eight billion, two hundred eighty-two million, five hundred fifty-seven thousand, four hundred twenty".