28323731 has 2 divisors, whose sum is σ = 28323732. Its totient is φ = 28323730.

The previous prime is 28323727. The next prime is 28323761. The reversal of 28323731 is 13732382.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28323731 - 2² = 28323727 is a prime.

It is a super-2 number, since 2×28323731² = 1604467475520722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 28323694 and 28323703.

It is not a weakly prime, because it can be changed into another prime (28323761) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14161865 + 14161866.

It is an arithmetic number, because the mean of its divisors is an integer number (14161866).

Almost surely, 2^28323731 is an apocalyptic number.

28323731 is a deficient number, since it is larger than the sum of its proper divisors (1).

28323731 is an equidigital number, since it uses as much as digits as its factorization.

28323731 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6048, while the sum is 29.

The square root of 28323731 is about 5322.0044156314. The cubic root of 28323731 is about 304.8246990488.

The spelling of 28323731 in words is "twenty-eight million, three hundred twenty-three thousand, seven hundred thirty-one".