28823731 has 4 divisors (see below), whose sum is σ = 28947672. Its totient is φ = 28699792.

The previous prime is 28823719. The next prime is 28823747. The reversal of 28823731 is 13732882.

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 28823731 - 2⁹ = 28823219 is a prime.

It is a super-2 number, since 2×28823731² = 1661614937520722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28823131) 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, 61621 + ... + 62086.

It is an arithmetic number, because the mean of its divisors is an integer number (7236918).

Almost surely, 2^28823731 is an apocalyptic number.

28823731 is a deficient number, since it is larger than the sum of its proper divisors (123941).

28823731 is a wasteful number, since it uses less digits than its factorization.

28823731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123940.

The product of its digits is 16128, while the sum is 34.

The square root of 28823731 is about 5368.7736961060. The cubic root of 28823731 is about 306.6079409971.

The spelling of 28823731 in words is "twenty-eight million, eight hundred twenty-three thousand, seven hundred thirty-one".