28863731 has 8 divisors (see below), whose sum is σ = 31224144. Its totient is φ = 26523360.

The previous prime is 28863727. The next prime is 28863733. The reversal of 28863731 is 13736882.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28863731 - 2² = 28863727 is a prime.

It is a super-2 number, since 2×28863731² = 1666229934480722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28863733) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1940 + ... + 7841.

It is an arithmetic number, because the mean of its divisors is an integer number (3903018).

Almost surely, 2^28863731 is an apocalyptic number.

28863731 is a deficient number, since it is larger than the sum of its proper divisors (2360413).

28863731 is a wasteful number, since it uses less digits than its factorization.

28863731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10021.

The product of its digits is 48384, while the sum is 38.

The square root of 28863731 is about 5372.4976500693. The cubic root of 28863731 is about 306.7497066920.

The spelling of 28863731 in words is "twenty-eight million, eight hundred sixty-three thousand, seven hundred thirty-one".