28999880 has 128 divisors (see below), whose sum is σ = 83220480. Its totient is φ = 8847360.

The previous prime is 28999853. The next prime is 28999891. The reversal of 28999880 is 8899982.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 112712 + ... + 112968.

It is an arithmetic number, because the mean of its divisors is an integer number (650160).

Almost surely, 2^28999880 is an apocalyptic number.

28999880 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 28999880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41610240).

28999880 is an abundant number, since it is smaller than the sum of its proper divisors (54220600).

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

28999880 is a wasteful number, since it uses less digits than its factorization.

28999880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 319 (or 315 counting only the distinct ones).

The product of its (nonzero) digits is 746496, while the sum is 53.

The square root of 28999880 is about 5385.1536654027. The cubic root of 28999880 is about 307.2312588002.

The spelling of 28999880 in words is "twenty-eight million, nine hundred ninety-nine thousand, eight hundred eighty".