28409964 has 48 divisors (see below), whose sum is σ = 72890496. Its totient is φ = 8540800.

The previous prime is 28409947. The next prime is 28409989. The reversal of 28409964 is 46990482.

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, 17299 + ... + 18869.

It is an arithmetic number, because the mean of its divisors is an integer number (1518552).

Almost surely, 2^28409964 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 28409964, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36445248).

28409964 is an abundant number, since it is smaller than the sum of its proper divisors (44480532).

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

28409964 is a wasteful number, since it uses less digits than its factorization.

28409964 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1726 (or 1724 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 42.

The square root of 28409964 is about 5330.0998114482. The cubic root of 28409964 is about 305.1337369249.

The spelling of 28409964 in words is "twenty-eight million, four hundred nine thousand, nine hundred sixty-four".