28871737 has 2 divisors, whose sum is σ = 28871738. Its totient is φ = 28871736.

The previous prime is 28871683. The next prime is 28871741. The reversal of 28871737 is 73717882.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26378496 + 2493241 = 5136^2 + 1579^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28871737 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28871693 and 28871702.

It is not a weakly prime, because it can be changed into another prime (28871747) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14435868 + 14435869.

It is an arithmetic number, because the mean of its divisors is an integer number (14435869).

Almost surely, 2^28871737 is an apocalyptic number.

It is an amenable number.

28871737 is a deficient number, since it is larger than the sum of its proper divisors (1).

28871737 is an equidigital number, since it uses as much as digits as its factorization.

28871737 is an evil number, because the sum of its binary digits is even.

The product of its digits is 131712, while the sum is 43.

The square root of 28871737 is about 5373.2426894753. The cubic root of 28871737 is about 306.7780653626.

It can be divided in two parts, 2887 and 1737, that added together give a square (4624 = 68²).

The spelling of 28871737 in words is "twenty-eight million, eight hundred seventy-one thousand, seven hundred thirty-seven".