28011337 has 4 divisors (see below), whose sum is σ = 28225296. Its totient is φ = 27797380.

The previous prime is 28011329. The next prime is 28011343. The reversal of 28011337 is 73311082.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 28011337 - 2³ = 28011329 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28011367) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 106783 + ... + 107044.

It is an arithmetic number, because the mean of its divisors is an integer number (7056324).

Almost surely, 2^28011337 is an apocalyptic number.

It is an amenable number.

28011337 is a deficient number, since it is larger than the sum of its proper divisors (213959).

28011337 is a wasteful number, since it uses less digits than its factorization.

28011337 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 213958.

The product of its (nonzero) digits is 1008, while the sum is 25.

The square root of 28011337 is about 5292.5737595238. The cubic root of 28011337 is about 303.6998747637.

The spelling of 28011337 in words is "twenty-eight million, eleven thousand, three hundred thirty-seven".