28550218720 has 48 divisors (see below), whose sum is σ = 67605829200. Its totient is φ = 11393685504.

The previous prime is 28550218717. The next prime is 28550218789. The reversal of 28550218720 is 2781205582.

It is a super-2 number, since 2×28550218720² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 136770 + ... + 275329.

It is an arithmetic number, because the mean of its divisors is an integer number (1408454775).

Almost surely, 2^28550218720 is an apocalyptic number.

28550218720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28550218720 is an abundant number, since it is smaller than the sum of its proper divisors (39055610480).

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

28550218720 is a wasteful number, since it uses less digits than its factorization.

28550218720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 412547 (or 412539 counting only the distinct ones).

The product of its (nonzero) digits is 89600, while the sum is 40.

The spelling of 28550218720 in words is "twenty-eight billion, five hundred fifty million, two hundred eighteen thousand, seven hundred twenty".