28331724 has 48 divisors (see below), whose sum is σ = 72424800. Its totient is φ = 8580096.

The previous prime is 28331701. The next prime is 28331747. The reversal of 28331724 is 42713382.

It is an interprime number because it is at equal distance from previous prime (28331701) and next prime (28331747).

It is a junction number, because it is equal to n+sod(n) for n = 28331691 and 28331700.

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, 3522 + ... + 8310.

It is an arithmetic number, because the mean of its divisors is an integer number (1508850).

Almost surely, 2^28331724 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 28331724, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36212400).

28331724 is an abundant number, since it is smaller than the sum of its proper divisors (44093076).

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

28331724 is a wasteful number, since it uses less digits than its factorization.

28331724 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4842 (or 4840 counting only the distinct ones).

The product of its digits is 8064, while the sum is 30.

The square root of 28331724 is about 5322.7553015332. The cubic root of 28331724 is about 304.8533703500.

The spelling of 28331724 in words is "twenty-eight million, three hundred thirty-one thousand, seven hundred twenty-four".