28278709900 has 72 divisors (see below), whose sum is σ = 70303382240. Its totient is φ = 9671754240.

The previous prime is 28278709897. The next prime is 28278709903. The reversal of 28278709900 is 990787282.

It is an interprime number because it is at equal distance from previous prime (28278709897) and next prime (28278709903).

It is not an unprimeable number, because it can be changed into a prime (28278709903) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 236914 + ... + 335686.

Almost surely, 2^28278709900 is an apocalyptic number.

28278709900 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 28278709900, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35151691120).

28278709900 is an abundant number, since it is smaller than the sum of its proper divisors (42024672340).

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

28278709900 is a wasteful number, since it uses less digits than its factorization.

28278709900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99203 (or 99196 counting only the distinct ones).

The product of its (nonzero) digits is 1016064, while the sum is 52.

The spelling of 28278709900 in words is "twenty-eight billion, two hundred seventy-eight million, seven hundred nine thousand, nine hundred".