28280280100 has 36 divisors (see below), whose sum is σ = 63347834368. Its totient is φ = 10947204000.

The previous prime is 28280280053. The next prime is 28280280101. The reversal of 28280280100 is 108208282.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is not an unprimeable number, because it can be changed into a prime (28280280101) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4558236 + ... + 4564435.

Almost surely, 2^28280280100 is an apocalyptic number.

28280280100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28280280100 is an abundant number, since it is smaller than the sum of its proper divisors (35067554268).

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

28280280100 is a wasteful number, since it uses less digits than its factorization.

28280280100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9122716 (or 9122709 counting only the distinct ones).

The product of its (nonzero) digits is 4096, while the sum is 31.

Adding to 28280280100 its reverse (108208282), we get a palindrome (28388488382).

The spelling of 28280280100 in words is "twenty-eight billion, two hundred eighty million, two hundred eighty thousand, one hundred".