28988434 has 12 divisors (see below), whose sum is σ = 46191834. Its totient is φ = 13641344.

The previous prime is 28988431. The next prime is 28988437. The reversal of 28988434 is 43488982.

It is an interprime number because it is at equal distance from previous prime (28988431) and next prime (28988437).

It can be written as a sum of positive squares in 3 ways, for example, as 28783225 + 205209 = 5365^2 + 453^2 .

It is not an unprimeable number, because it can be changed into a prime (28988431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 24499 + ... + 25654.

Almost surely, 2^28988434 is an apocalyptic number.

28988434 is a deficient number, since it is larger than the sum of its proper divisors (17203400).

28988434 is a wasteful number, since it uses less digits than its factorization.

28988434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50189 (or 50172 counting only the distinct ones).

The product of its digits is 442368, while the sum is 46.

The square root of 28988434 is about 5384.0908238996. The cubic root of 28988434 is about 307.1908329807.

The spelling of 28988434 in words is "twenty-eight million, nine hundred eighty-eight thousand, four hundred thirty-four".