28909017900 has 216 divisors, whose sum is σ = 104586160224. Its totient is φ = 6542208000.

The previous prime is 28909017899. The next prime is 28909017913. The reversal of 28909017900 is 971090982.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 613584 + ... + 659016.

Almost surely, 2^28909017900 is an apocalyptic number.

28909017900 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 28909017900, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (52293080112).

28909017900 is an abundant number, since it is smaller than the sum of its proper divisors (75677142324).

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

28909017900 is a wasteful number, since it uses less digits than its factorization.

28909017900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45561 (or 45551 counting only the distinct ones).

The product of its (nonzero) digits is 81648, while the sum is 45.

The spelling of 28909017900 in words is "twenty-eight billion, nine hundred nine million, seventeen thousand, nine hundred".