28715971 has 2 divisors, whose sum is σ = 28715972. Its totient is φ = 28715970.

The previous prime is 28715963. The next prime is 28716001. The reversal of 28715971 is 17951782.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28715971 - 2³ = 28715963 is a prime.

It is not a weakly prime, because it can be changed into another prime (28715471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14357985 + 14357986.

It is an arithmetic number, because the mean of its divisors is an integer number (14357986).

Almost surely, 2^28715971 is an apocalyptic number.

28715971 is a deficient number, since it is larger than the sum of its proper divisors (1).

28715971 is an equidigital number, since it uses as much as digits as its factorization.

28715971 is an evil number, because the sum of its binary digits is even.

The product of its digits is 35280, while the sum is 40.

The square root of 28715971 is about 5358.7284872440. The cubic root of 28715971 is about 306.2253704474.

The spelling of 28715971 in words is "twenty-eight million, seven hundred fifteen thousand, nine hundred seventy-one".