28908144 has 80 divisors (see below), whose sum is σ = 84414240. Its totient is φ = 9469440.

The previous prime is 28908091. The next prime is 28908193. The reversal of 28908144 is 44180982.

It is a super-4 number, since 4×28908144⁴ (a number of 31 digits) contains 4444 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 28908099 and 28908108.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25804 + ... + 26900.

It is an arithmetic number, because the mean of its divisors is an integer number (1055178).

Almost surely, 2^28908144 is an apocalyptic number.

28908144 is a gapful number since it is divisible by the number (24) 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 28908144, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42207120).

28908144 is an abundant number, since it is smaller than the sum of its proper divisors (55506096).

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

28908144 is a wasteful number, since it uses less digits than its factorization.

28908144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1175 (or 1163 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 36.

The square root of 28908144 is about 5376.6294274387. The cubic root of 28908144 is about 306.9069593244.

The spelling of 28908144 in words is "twenty-eight million, nine hundred eight thousand, one hundred forty-four".