28920571 has 2 divisors, whose sum is σ = 28920572. Its totient is φ = 28920570.

The previous prime is 28920547. The next prime is 28920589. The reversal of 28920571 is 17502982.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28920571 is a prime.

It is not a weakly prime, because it can be changed into another prime (28920371) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14460285 + 14460286.

It is an arithmetic number, because the mean of its divisors is an integer number (14460286).

Almost surely, 2^28920571 is an apocalyptic number.

28920571 is a deficient number, since it is larger than the sum of its proper divisors (1).

28920571 is an equidigital number, since it uses as much as digits as its factorization.

28920571 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10080, while the sum is 34.

The square root of 28920571 is about 5377.7849529337. The cubic root of 28920571 is about 306.9509306289.

The spelling of 28920571 in words is "twenty-eight million, nine hundred twenty thousand, five hundred seventy-one".