28277255820 has 96 divisors (see below), whose sum is σ = 86451402240. Its totient is φ = 6848962560.

The previous prime is 28277255791. The next prime is 28277255821. The reversal of 28277255820 is 2855277282.

It is a self number, because there is not a number n which added to its sum of digits gives 28277255820.

It is not an unprimeable number, because it can be changed into a prime (28277255821) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 742401 + ... + 779559.

It is an arithmetic number, because the mean of its divisors is an integer number (900535440).

Almost surely, 2^28277255820 is an apocalyptic number.

28277255820 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 28277255820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43225701120).

28277255820 is an abundant number, since it is smaller than the sum of its proper divisors (58174146420).

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

28277255820 is a wasteful number, since it uses less digits than its factorization.

28277255820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38335 (or 38333 counting only the distinct ones).

The product of its (nonzero) digits is 1254400, while the sum is 48.

The spelling of 28277255820 in words is "twenty-eight billion, two hundred seventy-seven million, two hundred fifty-five thousand, eight hundred twenty".