28315388 has 12 divisors (see below), whose sum is σ = 49931112. Its totient is φ = 14049360.

The previous prime is 28315381. The next prime is 28315423. The reversal of 28315388 is 88351382.

It is a super-2 number, since 2×28315388² = 1603522395181088, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28315381) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 26495 + ... + 27542.

It is an arithmetic number, because the mean of its divisors is an integer number (4160926).

Almost surely, 2^28315388 is an apocalyptic number.

It is an amenable number.

28315388 is a deficient number, since it is larger than the sum of its proper divisors (21615724).

28315388 is a wasteful number, since it uses less digits than its factorization.

28315388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54172 (or 54170 counting only the distinct ones).

The product of its digits is 46080, while the sum is 38.

The square root of 28315388 is about 5321.2205366814. The cubic root of 28315388 is about 304.7947665256.

The spelling of 28315388 in words is "twenty-eight million, three hundred fifteen thousand, three hundred eighty-eight".