28989901 has 2 divisors, whose sum is σ = 28989902. Its totient is φ = 28989900.

The previous prime is 28989889. The next prime is 28989931. The reversal of 28989901 is 10998982.

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., 21399876 + 7590025 = 4626^2 + 2755^2 .

It is a cyclic number.

It is not a de Polignac number, because 28989901 - 2¹¹ = 28987853 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28989931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14494950 + 14494951.

It is an arithmetic number, because the mean of its divisors is an integer number (14494951).

Almost surely, 2^28989901 is an apocalyptic number.

It is an amenable number.

28989901 is a deficient number, since it is larger than the sum of its proper divisors (1).

28989901 is an equidigital number, since it uses as much as digits as its factorization.

28989901 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 93312, while the sum is 46.

The square root of 28989901 is about 5384.2270568764. The cubic root of 28989901 is about 307.1960148330.

It can be divided in two parts, 28989 and 901, that added together give a triangular number (29890 = T₂₄₄).

The spelling of 28989901 in words is "twenty-eight million, nine hundred eighty-nine thousand, nine hundred one".