28333144 has 16 divisors (see below), whose sum is σ = 60714000. Its totient is φ = 12142752.

The previous prime is 28333141. The next prime is 28333147. The reversal of 28333144 is 44133382.

It is an interprime number because it is at equal distance from previous prime (28333141) and next prime (28333147).

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28333141) 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, 252919 + ... + 253030.

It is an arithmetic number, because the mean of its divisors is an integer number (3794625).

Almost surely, 2^28333144 is an apocalyptic number.

It is an amenable number.

28333144 is an abundant number, since it is smaller than the sum of its proper divisors (32380856).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28333144 is a wasteful number, since it uses less digits than its factorization.

28333144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 505962 (or 505958 counting only the distinct ones).

The product of its digits is 6912, while the sum is 28.

The square root of 28333144 is about 5322.8886894242. Note that the first 3 decimals coincide. The cubic root of 28333144 is about 304.8584633987.

The spelling of 28333144 in words is "twenty-eight million, three hundred thirty-three thousand, one hundred forty-four".