28889434 has 16 divisors (see below), whose sum is σ = 50017536. Its totient is φ = 12258000.

The previous prime is 28889411. The next prime is 28889453. The reversal of 28889434 is 43498882.

It is a super-3 number, since 3×28889434³ (a number of 23 digits) contains 333 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8802 + ... + 11629.

It is an arithmetic number, because the mean of its divisors is an integer number (3126096).

Almost surely, 2^28889434 is an apocalyptic number.

28889434 is a deficient number, since it is larger than the sum of its proper divisors (21128102).

28889434 is a wasteful number, since it uses less digits than its factorization.

28889434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20541.

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

The square root of 28889434 is about 5374.8892081605. The cubic root of 28889434 is about 306.8407326758.

It can be divided in two parts, 2 and 8889434, that added together give a triangular number (8889436 = T₄₂₁₆).

The spelling of 28889434 in words is "twenty-eight million, eight hundred eighty-nine thousand, four hundred thirty-four".