28751731 has 8 divisors (see below), whose sum is σ = 31309200. Its totient is φ = 26298720.

The previous prime is 28751713. The next prime is 28751741. The reversal of 28751731 is 13715782.

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 28751731 - 2⁵ = 28751699 is a prime.

It is a super-2 number, since 2×28751731² = 1653324070992722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28751711) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25540 + ... + 26641.

It is an arithmetic number, because the mean of its divisors is an integer number (3913650).

Almost surely, 2^28751731 is an apocalyptic number.

28751731 is a deficient number, since it is larger than the sum of its proper divisors (2557469).

28751731 is a wasteful number, since it uses less digits than its factorization.

28751731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52229.

The product of its digits is 11760, while the sum is 34.

The square root of 28751731 is about 5362.0640615345. The cubic root of 28751731 is about 306.3524318748.

The spelling of 28751731 in words is "twenty-eight million, seven hundred fifty-one thousand, seven hundred thirty-one".