28820629 has 2 divisors, whose sum is σ = 28820630. Its totient is φ = 28820628.

The previous prime is 28820569. The next prime is 28820639. The reversal of 28820629 is 92602882.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27615025 + 1205604 = 5255^2 + 1098^2 .

It is a cyclic number.

It is not a de Polignac number, because 28820629 - 2¹³ = 28812437 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28820639) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14410314 + 14410315.

It is an arithmetic number, because the mean of its divisors is an integer number (14410315).

Almost surely, 2^28820629 is an apocalyptic number.

It is an amenable number.

28820629 is a deficient number, since it is larger than the sum of its proper divisors (1).

28820629 is an equidigital number, since it uses as much as digits as its factorization.

28820629 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27648, while the sum is 37.

The square root of 28820629 is about 5368.4847955452. The cubic root of 28820629 is about 306.5969415889.

The spelling of 28820629 in words is "twenty-eight million, eight hundred twenty thousand, six hundred twenty-nine".