28430971 has 2 divisors, whose sum is σ = 28430972. Its totient is φ = 28430970.

The previous prime is 28430959. The next prime is 28430977. The reversal of 28430971 is 17903482.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28430971 - 2¹¹ = 28428923 is a prime.

It is a super-2 number, since 2×28430971² = 1616640224005682, which contains 22 as substring.

It is equal to p_1766563 and since 28430971 and 1766563 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (28430977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14215485 + 14215486.

It is an arithmetic number, because the mean of its divisors is an integer number (14215486).

Almost surely, 2^28430971 is an apocalyptic number.

28430971 is a deficient number, since it is larger than the sum of its proper divisors (1).

28430971 is an equidigital number, since it uses as much as digits as its factorization.

28430971 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12096, while the sum is 34.

The square root of 28430971 is about 5332.0700483021. The cubic root of 28430971 is about 305.2089260988.

The spelling of 28430971 in words is "twenty-eight million, four hundred thirty thousand, nine hundred seventy-one".