28772144 has 20 divisors (see below), whose sum is σ = 56119920. Its totient is φ = 14289600.

The previous prime is 28772141. The next prime is 28772153. The reversal of 28772144 is 44127782.

It is a happy number.

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (28772141) 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, 3539 + ... + 8370.

It is an arithmetic number, because the mean of its divisors is an integer number (2805996).

Almost surely, 2^28772144 is an apocalyptic number.

It is an amenable number.

28772144 is a deficient number, since it is larger than the sum of its proper divisors (27347776).

28772144 is a wasteful number, since it uses less digits than its factorization.

28772144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12068 (or 12062 counting only the distinct ones).

The product of its digits is 25088, while the sum is 35.

The square root of 28772144 is about 5363.9671885648. The cubic root of 28772144 is about 306.4249155433.

The spelling of 28772144 in words is "twenty-eight million, seven hundred seventy-two thousand, one hundred forty-four".