28724332 has 96 divisors (see below), whose sum is σ = 66834432. Its totient is φ = 10492416.

The previous prime is 28724303. The next prime is 28724341. The reversal of 28724332 is 23342782.

It is a junction number, because it is equal to n+sod(n) for n = 28724294 and 28724303.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 393448 + ... + 393520.

It is an arithmetic number, because the mean of its divisors is an integer number (696192).

Almost surely, 2^28724332 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 28724332, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33417216).

28724332 is an abundant number, since it is smaller than the sum of its proper divisors (38110100).

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

28724332 is a wasteful number, since it uses less digits than its factorization.

28724332 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 167 (or 165 counting only the distinct ones).

The product of its digits is 16128, while the sum is 31.

The square root of 28724332 is about 5359.5085595603. The cubic root of 28724332 is about 306.2550879621.

The spelling of 28724332 in words is "twenty-eight million, seven hundred twenty-four thousand, three hundred thirty-two".