28771302220 has 24 divisors (see below), whose sum is σ = 60435131904. Its totient is φ = 11505588096.

The previous prime is 28771302199. The next prime is 28771302223. The reversal of 28771302220 is 2220317782.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (28771302223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 101977 + ... + 260656.

It is an arithmetic number, because the mean of its divisors is an integer number (2518130496).

Almost surely, 2^28771302220 is an apocalyptic number.

28771302220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28771302220 is an abundant number, since it is smaller than the sum of its proper divisors (31663829684).

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

28771302220 is a wasteful number, since it uses less digits than its factorization.

28771302220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 366609 (or 366607 counting only the distinct ones).

The product of its (nonzero) digits is 18816, while the sum is 34.

The spelling of 28771302220 in words is "twenty-eight billion, seven hundred seventy-one million, three hundred two thousand, two hundred twenty".