28545442 has 4 divisors (see below), whose sum is σ = 42818166. Its totient is φ = 14272720.

The previous prime is 28545437. The next prime is 28545469. The reversal of 28545442 is 24454582.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 24454582 = 2 ⋅12227291.

It can be written as a sum of positive squares in only one way, i.e., 21986721 + 6558721 = 4689^2 + 2561^2 .

It is a junction number, because it is equal to n+sod(n) for n = 28545398 and 28545407.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7136359 + ... + 7136362.

Almost surely, 2^28545442 is an apocalyptic number.

28545442 is a deficient number, since it is larger than the sum of its proper divisors (14272724).

28545442 is a wasteful number, since it uses less digits than its factorization.

28545442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14272723.

The product of its digits is 51200, while the sum is 34.

The square root of 28545442 is about 5342.7934640972. The cubic root of 28545442 is about 305.6179962653.

The spelling of 28545442 in words is "twenty-eight million, five hundred forty-five thousand, four hundred forty-two".