28661189 has 2 divisors, whose sum is σ = 28661190. Its totient is φ = 28661188.

The previous prime is 28661183. The next prime is 28661219. The reversal of 28661189 is 98116682.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27384289 + 1276900 = 5233^2 + 1130^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28661189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28661183) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14330594 + 14330595.

It is an arithmetic number, because the mean of its divisors is an integer number (14330595).

Almost surely, 2^28661189 is an apocalyptic number.

It is an amenable number.

28661189 is a deficient number, since it is larger than the sum of its proper divisors (1).

28661189 is an equidigital number, since it uses as much as digits as its factorization.

28661189 is an evil number, because the sum of its binary digits is even.

The product of its digits is 41472, while the sum is 41.

The square root of 28661189 is about 5353.6145733514. The cubic root of 28661189 is about 306.0305158455.

The spelling of 28661189 in words is "twenty-eight million, six hundred sixty-one thousand, one hundred eighty-nine".