28736731 has 2 divisors, whose sum is σ = 28736732. Its totient is φ = 28736730.

The previous prime is 28736699. The next prime is 28736789. The reversal of 28736731 is 13763782.

28736731 is nontrivially palindromic in base 2.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28736731 - 2⁵ = 28736699 is a prime.

It is a super-2 number, since 2×28736731² = 1651599417132722, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (28736791) 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 as a sum of consecutive naturals, namely, 14368365 + 14368366.

It is an arithmetic number, because the mean of its divisors is an integer number (14368366).

Almost surely, 2^28736731 is an apocalyptic number.

28736731 is a deficient number, since it is larger than the sum of its proper divisors (1).

28736731 is an equidigital number, since it uses as much as digits as its factorization.

28736731 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 42336, while the sum is 37.

The square root of 28736731 is about 5360.6651639512. The cubic root of 28736731 is about 306.2991471312.

It can be divided in two parts, 2873 and 6731, that added together give a square (9604 = 98²).

The spelling of 28736731 in words is "twenty-eight million, seven hundred thirty-six thousand, seven hundred thirty-one".