28321967 has 2 divisors, whose sum is σ = 28321968. Its totient is φ = 28321966.

The previous prime is 28321957. The next prime is 28321973. The reversal of 28321967 is 76912382.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28321967 - 2⁶ = 28321903 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28321967.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28321927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14160983 + 14160984.

It is an arithmetic number, because the mean of its divisors is an integer number (14160984).

Almost surely, 2^28321967 is an apocalyptic number.

28321967 is a deficient number, since it is larger than the sum of its proper divisors (1).

28321967 is an equidigital number, since it uses as much as digits as its factorization.

28321967 is an evil number, because the sum of its binary digits is even.

The product of its digits is 36288, while the sum is 38.

The square root of 28321967 is about 5321.8386860182. The cubic root of 28321967 is about 304.8183707637.

The spelling of 28321967 in words is "twenty-eight million, three hundred twenty-one thousand, nine hundred sixty-seven".