28988347 has 2 divisors, whose sum is σ = 28988348. Its totient is φ = 28988346.

The previous prime is 28988299. The next prime is 28988381. The reversal of 28988347 is 74388982.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28988347 is a prime.

It is equal to p_1798987 and since 28988347 and 1798987 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28988347.

It is not a weakly prime, because it can be changed into another prime (28988147) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14494173 + 14494174.

It is an arithmetic number, because the mean of its divisors is an integer number (14494174).

Almost surely, 2^28988347 is an apocalyptic number.

28988347 is a deficient number, since it is larger than the sum of its proper divisors (1).

28988347 is an equidigital number, since it uses as much as digits as its factorization.

28988347 is an evil number, because the sum of its binary digits is even.

The product of its digits is 774144, while the sum is 49.

The square root of 28988347 is about 5384.0827445350. The cubic root of 28988347 is about 307.1905256670.

The spelling of 28988347 in words is "twenty-eight million, nine hundred eighty-eight thousand, three hundred forty-seven".