28902989 has 2 divisors, whose sum is σ = 28902990. Its totient is φ = 28902988.

The previous prime is 28902983. The next prime is 28903001. The reversal of 28902989 is 98920982.

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., 28536964 + 366025 = 5342^2 + 605^2 .

It is a cyclic number.

It is not a de Polignac number, because 28902989 - 2¹² = 28898893 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28902983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14451494 + 14451495.

It is an arithmetic number, because the mean of its divisors is an integer number (14451495).

Almost surely, 2^28902989 is an apocalyptic number.

It is an amenable number.

28902989 is a deficient number, since it is larger than the sum of its proper divisors (1).

28902989 is an equidigital number, since it uses as much as digits as its factorization.

28902989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 186624, while the sum is 47.

The square root of 28902989 is about 5376.1500165081. The cubic root of 28902989 is about 306.8887153372. Note that the first 3 decimals are identical.

The spelling of 28902989 in words is "twenty-eight million, nine hundred two thousand, nine hundred eighty-nine".