28765442 has 4 divisors (see below), whose sum is σ = 43148166. Its totient is φ = 14382720.

The previous prime is 28765421. The next prime is 28765453. The reversal of 28765442 is 24456782.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 25593481 + 3171961 = 5059^2 + 1781^2 .

It is a junction number, because it is equal to n+sod(n) for n = 28765396 and 28765405.

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 as a sum of consecutive naturals, namely, 7191359 + ... + 7191362.

Almost surely, 2^28765442 is an apocalyptic number.

28765442 is a deficient number, since it is larger than the sum of its proper divisors (14382724).

28765442 is a wasteful number, since it uses less digits than its factorization.

28765442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14382723.

The product of its digits is 107520, while the sum is 38.

The square root of 28765442 is about 5363.3424280014. The cubic root of 28765442 is about 306.4011214729.

The spelling of 28765442 in words is "twenty-eight million, seven hundred sixty-five thousand, four hundred forty-two".