28340842 has 4 divisors (see below), whose sum is σ = 42511266. Its totient is φ = 14170420.

The previous prime is 28340839. The next prime is 28340861. The reversal of 28340842 is 24804382.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 24804382 = 2 ⋅12402191.

It can be written as a sum of positive squares in only one way, i.e., 22382361 + 5958481 = 4731^2 + 2441^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7085209 + ... + 7085212.

Almost surely, 2^28340842 is an apocalyptic number.

28340842 is a deficient number, since it is larger than the sum of its proper divisors (14170424).

28340842 is a wasteful number, since it uses less digits than its factorization.

28340842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14170423.

The product of its (nonzero) digits is 12288, while the sum is 31.

The square root of 28340842 is about 5323.6117439197. The cubic root of 28340842 is about 304.8860705002.

The spelling of 28340842 in words is "twenty-eight million, three hundred forty thousand, eight hundred forty-two".