28989157 has 2 divisors, whose sum is σ = 28989158. Its totient is φ = 28989156.

The previous prime is 28989143. The next prime is 28989197. The reversal of 28989157 is 75198982.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21585316 + 7403841 = 4646^2 + 2721^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28989157 is a prime.

It is a super-3 number, since 3×28989157³ (a number of 23 digits) contains 333 as substring.

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 28989157.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28989137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14494578 + 14494579.

It is an arithmetic number, because the mean of its divisors is an integer number (14494579).

Almost surely, 2^28989157 is an apocalyptic number.

It is an amenable number.

28989157 is a deficient number, since it is larger than the sum of its proper divisors (1).

28989157 is an equidigital number, since it uses as much as digits as its factorization.

28989157 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 362880, while the sum is 49.

The square root of 28989157 is about 5384.1579657361. The cubic root of 28989157 is about 307.1933868397.

The spelling of 28989157 in words is "twenty-eight million, nine hundred eighty-nine thousand, one hundred fifty-seven".