28440518 has 16 divisors (see below), whose sum is σ = 43765056. Its totient is φ = 13856640.

The previous prime is 28440491. The next prime is 28440521. The reversal of 28440518 is 81504482.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12755 + ... + 14817.

It is an arithmetic number, because the mean of its divisors is an integer number (2735316).

Almost surely, 2^28440518 is an apocalyptic number.

28440518 is a deficient number, since it is larger than the sum of its proper divisors (15324538).

28440518 is a wasteful number, since it uses less digits than its factorization.

28440518 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2239.

The product of its (nonzero) digits is 10240, while the sum is 32.

The square root of 28440518 is about 5332.9652164626. The cubic root of 28440518 is about 305.2430848985.

The spelling of 28440518 in words is "twenty-eight million, four hundred forty thousand, five hundred eighteen".