28871657 has 2 divisors, whose sum is σ = 28871658. Its totient is φ = 28871656.

The previous prime is 28871651. The next prime is 28871669. The reversal of 28871657 is 75617882.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17147881 + 11723776 = 4141^2 + 3424^2 .

It is a cyclic number.

It is not a de Polignac number, because 28871657 - 2¹² = 28867561 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (28871651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14435828 + 14435829.

It is an arithmetic number, because the mean of its divisors is an integer number (14435829).

Almost surely, 2^28871657 is an apocalyptic number.

It is an amenable number.

28871657 is a deficient number, since it is larger than the sum of its proper divisors (1).

28871657 is an equidigital number, since it uses as much as digits as its factorization.

28871657 is an evil number, because the sum of its binary digits is even.

The product of its digits is 188160, while the sum is 44.

The square root of 28871657 is about 5373.2352451759. The cubic root of 28871657 is about 306.7777820144. Note that the first 4 decimals are identical.

The spelling of 28871657 in words is "twenty-eight million, eight hundred seventy-one thousand, six hundred fifty-seven".