28197629 has 2 divisors, whose sum is σ = 28197630. Its totient is φ = 28197628.

The previous prime is 28197623. The next prime is 28197641. The reversal of 28197629 is 92679182.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24304900 + 3892729 = 4930^2 + 1973^2 .

It is a cyclic number.

It is not a de Polignac number, because 28197629 - 2⁴ = 28197613 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28197629.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28197623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14098814 + 14098815.

It is an arithmetic number, because the mean of its divisors is an integer number (14098815).

Almost surely, 2^28197629 is an apocalyptic number.

It is an amenable number.

28197629 is a deficient number, since it is larger than the sum of its proper divisors (1).

28197629 is an equidigital number, since it uses as much as digits as its factorization.

28197629 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 108864, while the sum is 44.

The square root of 28197629 is about 5310.1439716829. The cubic root of 28197629 is about 304.3716491387.

The spelling of 28197629 in words is "twenty-eight million, one hundred ninety-seven thousand, six hundred twenty-nine".