28342388 has 12 divisors (see below), whose sum is σ = 49692132. Its totient is φ = 14144640.

The previous prime is 28342373. The next prime is 28342393. The reversal of 28342388 is 88324382.

It can be written as a sum of positive squares in 2 ways, for example, as 13380964 + 14961424 = 3658^2 + 3868^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4133 + ... + 8588.

It is an arithmetic number, because the mean of its divisors is an integer number (4141011).

Almost surely, 2^28342388 is an apocalyptic number.

It is an amenable number.

28342388 is a deficient number, since it is larger than the sum of its proper divisors (21349744).

28342388 is a wasteful number, since it uses less digits than its factorization.

28342388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13282 (or 13280 counting only the distinct ones).

The product of its digits is 73728, while the sum is 38.

The square root of 28342388 is about 5323.7569441138. The cubic root of 28342388 is about 304.8916142698.

The spelling of 28342388 in words is "twenty-eight million, three hundred forty-two thousand, three hundred eighty-eight".