30281144 has 8 divisors (see below), whose sum is σ = 56777160. Its totient is φ = 15140568.

The previous prime is 30281143. The next prime is 30281149. The reversal of 30281144 is 44118203.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30281143) by changing a digit.

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 as a sum of consecutive naturals, namely, 1892564 + ... + 1892579.

It is an arithmetic number, because the mean of its divisors is an integer number (7097145).

Almost surely, 2^30281144 is an apocalyptic number.

It is an amenable number.

30281144 is a deficient number, since it is larger than the sum of its proper divisors (26496016).

30281144 is a wasteful number, since it uses less digits than its factorization.

30281144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3785149 (or 3785145 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 23.

The square root of 30281144 is about 5502.8305443653. The cubic root of 30281144 is about 311.6908783590.

Adding to 30281144 its reverse (44118203), we get a palindrome (74399347).

The spelling of 30281144 in words is "thirty million, two hundred eighty-one thousand, one hundred forty-four".