28281008 has 20 divisors (see below), whose sum is σ = 62622480. Its totient is φ = 12120384.

The previous prime is 28280999. The next prime is 28281037. The reversal of 28281008 is 80018282.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 126143 + ... + 126366.

It is an arithmetic number, because the mean of its divisors is an integer number (3131124).

Almost surely, 2^28281008 is an apocalyptic number.

28281008 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

28281008 is an abundant number, since it is smaller than the sum of its proper divisors (34341472).

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

28281008 is a wasteful number, since it uses less digits than its factorization.

28281008 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 252524 (or 252518 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 29.

The square root of 28281008 is about 5317.9890936330. The cubic root of 28281008 is about 304.6713579158.

Subtracting from 28281008 its product of nonzero digits (2048), we obtain a triangular number (28278960 = T₇₅₂₀).

The spelling of 28281008 in words is "twenty-eight million, two hundred eighty-one thousand, eight".