28487197 has 2 divisors, whose sum is σ = 28487198. Its totient is φ = 28487196.

The previous prime is 28487191. The next prime is 28487219. The reversal of 28487197 is 79178482.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19660356 + 8826841 = 4434^2 + 2971^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28487197 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28487191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14243598 + 14243599.

It is an arithmetic number, because the mean of its divisors is an integer number (14243599).

Almost surely, 2^28487197 is an apocalyptic number.

It is an amenable number.

28487197 is a deficient number, since it is larger than the sum of its proper divisors (1).

28487197 is an equidigital number, since it uses as much as digits as its factorization.

28487197 is an evil number, because the sum of its binary digits is even.

The product of its digits is 225792, while the sum is 46.

The square root of 28487197 is about 5337.3398805023. The cubic root of 28487197 is about 305.4099905998.

The spelling of 28487197 in words is "twenty-eight million, four hundred eighty-seven thousand, one hundred ninety-seven".