28267731 has 16 divisors (see below), whose sum is σ = 42017920. Its totient is φ = 18782280.

The previous prime is 28267711. The next prime is 28267777. The reversal of 28267731 is 13776282.

It is not a de Polignac number, because 28267731 - 2⁹ = 28267219 is a prime.

It is a super-2 number, since 2×28267731² = 1598129231776722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28267711) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7356 + ... + 10518.

It is an arithmetic number, because the mean of its divisors is an integer number (2626120).

Almost surely, 2^28267731 is an apocalyptic number.

28267731 is a deficient number, since it is larger than the sum of its proper divisors (13750189).

28267731 is a wasteful number, since it uses less digits than its factorization.

28267731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3503 (or 3497 counting only the distinct ones).

The product of its digits is 28224, while the sum is 36.

The square root of 28267731 is about 5316.7406368940. The cubic root of 28267731 is about 304.6236727366.

The spelling of 28267731 in words is "twenty-eight million, two hundred sixty-seven thousand, seven hundred thirty-one".