28999144 has 16 divisors (see below), whose sum is σ = 57572100. Its totient is φ = 13646592.

The previous prime is 28999129. The next prime is 28999147. The reversal of 28999144 is 44199982.

It can be written as a sum of positive squares in 2 ways, for example, as 27436644 + 1562500 = 5238^2 + 1250^2 .

It is a super-3 number, since 3×28999144³ (a number of 23 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 28999094 and 28999103.

It is not an unprimeable number, because it can be changed into a prime (28999147) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 106479 + ... + 106750.

Almost surely, 2^28999144 is an apocalyptic number.

It is an amenable number.

28999144 is a deficient number, since it is larger than the sum of its proper divisors (28572956).

28999144 is a wasteful number, since it uses less digits than its factorization.

28999144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 213252 (or 213248 counting only the distinct ones).

The product of its digits is 186624, while the sum is 46.

The square root of 28999144 is about 5385.0853289433. The cubic root of 28999144 is about 307.2286596616.

It can be divided in two parts, 289 and 99144, that multiplied together give a cube (28652616 = 306³).

The spelling of 28999144 in words is "twenty-eight million, nine hundred ninety-nine thousand, one hundred forty-four".