28955880 has 128 divisors (see below), whose sum is σ = 98006400. Its totient is φ = 7698240.

The previous prime is 28955869. The next prime is 28955887. The reversal of 28955880 is 8855982.

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

It is not an unprimeable number, because it can be changed into a prime (28955887) 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, 87315 + ... + 87645.

It is an arithmetic number, because the mean of its divisors is an integer number (765675).

Almost surely, 2^28955880 is an apocalyptic number.

28955880 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 28955880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (49003200).

28955880 is an abundant number, since it is smaller than the sum of its proper divisors (69050520).

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

28955880 is an equidigital number, since it uses as much as digits as its factorization.

28955880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 363 (or 341 counting only the distinct ones).

The product of its (nonzero) digits is 230400, while the sum is 45.

The square root of 28955880 is about 5381.0668087285. The cubic root of 28955880 is about 307.0757981803.

It can be divided in two parts, 289 and 55880, that added together give a square (56169 = 237²).

The spelling of 28955880 in words is "twenty-eight million, nine hundred fifty-five thousand, eight hundred eighty".