28380337 has 4 divisors (see below), whose sum is σ = 28408896. Its totient is φ = 28351780.

The previous prime is 28380263. The next prime is 28380343. The reversal of 28380337 is 73308382.

It is a happy number.

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 28380337 - 2¹¹ = 28378289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28380347) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12733 + ... + 14794.

It is an arithmetic number, because the mean of its divisors is an integer number (7102224).

Almost surely, 2^28380337 is an apocalyptic number.

It is an amenable number.

28380337 is a deficient number, since it is larger than the sum of its proper divisors (28559).

28380337 is a wasteful number, since it uses less digits than its factorization.

28380337 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28558.

The product of its (nonzero) digits is 24192, while the sum is 34.

The square root of 28380337 is about 5327.3198702537. The cubic root of 28380337 is about 305.0276316451.

The spelling of 28380337 in words is "twenty-eight million, three hundred eighty thousand, three hundred thirty-seven".