28155671 has 2 divisors, whose sum is σ = 28155672. Its totient is φ = 28155670.

The previous prime is 28155649. The next prime is 28155683. The reversal of 28155671 is 17655182.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28155671 - 2¹⁸ = 27893527 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28155601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14077835 + 14077836.

It is an arithmetic number, because the mean of its divisors is an integer number (14077836).

Almost surely, 2^28155671 is an apocalyptic number.

28155671 is a deficient number, since it is larger than the sum of its proper divisors (1).

28155671 is an equidigital number, since it uses as much as digits as its factorization.

28155671 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16800, while the sum is 35.

The square root of 28155671 is about 5306.1917605756. The cubic root of 28155671 is about 304.2206061176.

The spelling of 28155671 in words is "twenty-eight million, one hundred fifty-five thousand, six hundred seventy-one".