28409484 has 48 divisors (see below), whose sum is σ = 71124480. Its totient is φ = 8798400.

The previous prime is 28409471. The next prime is 28409497. The reversal of 28409484 is 48490482.

It is an interprime number because it is at equal distance from previous prime (28409471) and next prime (28409497).

It is a super-2 number, since 2×28409484² = 1614197562292512, which contains 22 as substring.

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, 10909 + ... + 13259.

It is an arithmetic number, because the mean of its divisors is an integer number (1481760).

Almost surely, 2^28409484 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28409484, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35562240).

28409484 is an abundant number, since it is smaller than the sum of its proper divisors (42714996).

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

28409484 is a wasteful number, since it uses less digits than its factorization.

28409484 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2430 (or 2428 counting only the distinct ones).

The product of its (nonzero) digits is 73728, while the sum is 39.

The square root of 28409484 is about 5330.0547839586. The cubic root of 28409484 is about 305.1320184548.

The spelling of 28409484 in words is "twenty-eight million, four hundred nine thousand, four hundred eighty-four".