28520144 has 10 divisors (see below), whose sum is σ = 55257810. Its totient is φ = 14260064.

The previous prime is 28520143. The next prime is 28520179. The reversal of 28520144 is 44102582.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 18835600 + 9684544 = 4340^2 + 3112^2 .

It is a super-2 number, since 2×28520144² = 1626797227561472, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28520143) 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, 891239 + ... + 891270.

It is an arithmetic number, because the mean of its divisors is an integer number (5525781).

Almost surely, 2^28520144 is an apocalyptic number.

It is an amenable number.

28520144 is a deficient number, since it is larger than the sum of its proper divisors (26737666).

28520144 is a wasteful number, since it uses less digits than its factorization.

28520144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1782517 (or 1782511 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 26.

The square root of 28520144 is about 5340.4254512164. The cubic root of 28520144 is about 305.5276863520.

The spelling of 28520144 in words is "twenty-eight million, five hundred twenty thousand, one hundred forty-four".