28815442 has 16 divisors (see below), whose sum is σ = 46321632. Its totient is φ = 13395520.

The previous prime is 28815407. The next prime is 28815443. The reversal of 28815442 is 24451882.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is a junction number, because it is equal to n+sod(n) for n = 28815398 and 28815407.

It is not an unprimeable number, because it can be changed into a prime (28815443) 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 7 ways as a sum of consecutive naturals, for example, 2284 + ... + 7927.

It is an arithmetic number, because the mean of its divisors is an integer number (2895102).

Almost surely, 2^28815442 is an apocalyptic number.

28815442 is a deficient number, since it is larger than the sum of its proper divisors (17506190).

28815442 is a wasteful number, since it uses less digits than its factorization.

28815442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10313.

The product of its digits is 20480, while the sum is 34.

The square root of 28815442 is about 5368.0016766018. The cubic root of 28815442 is about 306.5785471979.

The spelling of 28815442 in words is "twenty-eight million, eight hundred fifteen thousand, four hundred forty-two".