28871651 has 2 divisors, whose sum is σ = 28871652. Its totient is φ = 28871650.

The previous prime is 28871611. The next prime is 28871657. The reversal of 28871651 is 15617882.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28871651 - 2¹⁰ = 28870627 is a prime.

It is not a weakly prime, because it can be changed into another prime (28871657) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14435825 + 14435826.

It is an arithmetic number, because the mean of its divisors is an integer number (14435826).

Almost surely, 2^28871651 is an apocalyptic number.

28871651 is a deficient number, since it is larger than the sum of its proper divisors (1).

28871651 is an equidigital number, since it uses as much as digits as its factorization.

28871651 is an evil number, because the sum of its binary digits is even.

The product of its digits is 26880, while the sum is 38.

The square root of 28871651 is about 5373.2346868530. The cubic root of 28871651 is about 306.7777607633. Note that the first 4 decimals are identical.

The spelling of 28871651 in words is "twenty-eight million, eight hundred seventy-one thousand, six hundred fifty-one".