28283731 has 6 divisors (see below), whose sum is σ = 32901540. Its totient is φ = 24243156.

The previous prime is 28283719. The next prime is 28283741. The reversal of 28283731 is 13738282.

It is a de Polignac number, because none of the positive numbers 2^k-28283731 is a prime.

It is a super-2 number, since 2×28283731² = 1599938878560722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28283711) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 288561 + ... + 288658.

It is an arithmetic number, because the mean of its divisors is an integer number (5483590).

Almost surely, 2^28283731 is an apocalyptic number.

28283731 is a deficient number, since it is larger than the sum of its proper divisors (4617809).

28283731 is an equidigital number, since it uses as much as digits as its factorization.

28283731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 577233 (or 577226 counting only the distinct ones).

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

The square root of 28283731 is about 5318.2451052955. The cubic root of 28283731 is about 304.6811358969.

The spelling of 28283731 in words is "twenty-eight million, two hundred eighty-three thousand, seven hundred thirty-one".