28306442 has 4 divisors (see below), whose sum is σ = 42459666. Its totient is φ = 14153220.

The previous prime is 28306393. The next prime is 28306459. The reversal of 28306442 is 24460382.

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., 14830201 + 13476241 = 3851^2 + 3671^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7076609 + ... + 7076612.

Almost surely, 2^28306442 is an apocalyptic number.

28306442 is a deficient number, since it is larger than the sum of its proper divisors (14153224).

28306442 is a wasteful number, since it uses less digits than its factorization.

28306442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14153223.

The product of its (nonzero) digits is 9216, while the sum is 29.

The square root of 28306442 is about 5320.3798736556. The cubic root of 28306442 is about 304.7626640614.

The spelling of 28306442 in words is "twenty-eight million, three hundred six thousand, four hundred forty-two".