28738247 has 4 divisors (see below), whose sum is σ = 29987760. Its totient is φ = 27488736.

The previous prime is 28738231. The next prime is 28738261. The reversal of 28738247 is 74283782.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28738247 - 2⁴ = 28738231 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28738207) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 624722 + ... + 624767.

It is an arithmetic number, because the mean of its divisors is an integer number (7496940).

Almost surely, 2^28738247 is an apocalyptic number.

28738247 is a deficient number, since it is larger than the sum of its proper divisors (1249513).

28738247 is a wasteful number, since it uses less digits than its factorization.

28738247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1249512.

The product of its digits is 150528, while the sum is 41.

The square root of 28738247 is about 5360.8065624493. The cubic root of 28738247 is about 306.3045332848.

The spelling of 28738247 in words is "twenty-eight million, seven hundred thirty-eight thousand, two hundred forty-seven".