28480398 has 16 divisors (see below), whose sum is σ = 58036176. Its totient is φ = 9314240.

The previous prime is 28480391. The next prime is 28480409. The reversal of 28480398 is 89308482.

It is a happy number.

It is a super-2 number, since 2×28480398² = 1622266140476808, which contains 22 as substring.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28480391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 44463 + ... + 45098.

It is an arithmetic number, because the mean of its divisors is an integer number (3627261).

Almost surely, 2^28480398 is an apocalyptic number.

28480398 is an abundant number, since it is smaller than the sum of its proper divisors (29555778).

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

28480398 is a wasteful number, since it uses less digits than its factorization.

28480398 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89619.

The product of its (nonzero) digits is 110592, while the sum is 42.

The square root of 28480398 is about 5336.7029147218. The cubic root of 28480398 is about 305.3856914062.

The spelling of 28480398 in words is "twenty-eight million, four hundred eighty thousand, three hundred ninety-eight".