28144233 has 32 divisors (see below), whose sum is σ = 45252480. Its totient is φ = 17184960.

The previous prime is 28144223. The next prime is 28144243. The reversal of 28144233 is 33244182.

It is an interprime number because it is at equal distance from previous prime (28144223) and next prime (28144243).

It is not a de Polignac number, because 28144233 - 2⁶ = 28144169 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 28144197 and 28144206.

It is not an unprimeable number, because it can be changed into a prime (28144213) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 63310 + ... + 63752.

It is an arithmetic number, because the mean of its divisors is an integer number (1414140).

Almost surely, 2^28144233 is an apocalyptic number.

It is an amenable number.

28144233 is a deficient number, since it is larger than the sum of its proper divisors (17108247).

28144233 is a wasteful number, since it uses less digits than its factorization.

28144233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 646 (or 640 counting only the distinct ones).

The product of its digits is 4608, while the sum is 27.

The square root of 28144233 is about 5305.1138536322. The cubic root of 28144233 is about 304.1794048668.

The spelling of 28144233 in words is "twenty-eight million, one hundred forty-four thousand, two hundred thirty-three".