28619729 has 2 divisors, whose sum is σ = 28619730. Its totient is φ = 28619728.

The previous prime is 28619713. The next prime is 28619743. The reversal of 28619729 is 92791682.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22543504 + 6076225 = 4748^2 + 2465^2 .

It is a cyclic number.

It is not a de Polignac number, because 28619729 - 2⁴ = 28619713 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28619729.

It is not a weakly prime, because it can be changed into another prime (28619029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14309864 + 14309865.

It is an arithmetic number, because the mean of its divisors is an integer number (14309865).

Almost surely, 2^28619729 is an apocalyptic number.

It is an amenable number.

28619729 is a deficient number, since it is larger than the sum of its proper divisors (1).

28619729 is an equidigital number, since it uses as much as digits as its factorization.

28619729 is an evil number, because the sum of its binary digits is even.

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

The square root of 28619729 is about 5349.7410217692. The cubic root of 28619729 is about 305.8828812621.

The spelling of 28619729 in words is "twenty-eight million, six hundred nineteen thousand, seven hundred twenty-nine".