28362731 has 4 divisors (see below), whose sum is σ = 28398600. Its totient is φ = 28326864.

The previous prime is 28362721. The next prime is 28362751. The reversal of 28362731 is 13726382.

It is a happy number.

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 28362731 - 2²² = 24168427 is a prime.

It is a super-2 number, since 2×28362731² = 1608889019556722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28362721) 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, 16721 + ... + 18338.

It is an arithmetic number, because the mean of its divisors is an integer number (7099650).

Almost surely, 2^28362731 is an apocalyptic number.

28362731 is a deficient number, since it is larger than the sum of its proper divisors (35869).

28362731 is an equidigital number, since it uses as much as digits as its factorization.

28362731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35868.

The product of its digits is 12096, while the sum is 32.

The square root of 28362731 is about 5325.6671882498. The cubic root of 28362731 is about 304.9645430429.

The spelling of 28362731 in words is "twenty-eight million, three hundred sixty-two thousand, seven hundred thirty-one".