28418728 has 32 divisors (see below), whose sum is σ = 57657600. Its totient is φ = 13053888.

The previous prime is 28418717. The next prime is 28418779. The reversal of 28418728 is 82781482.

It is a super-2 number, since 2×28418728² = 1615248202275968, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26833 + ... + 27871.

It is an arithmetic number, because the mean of its divisors is an integer number (1801800).

Almost surely, 2^28418728 is an apocalyptic number.

It is an amenable number.

28418728 is an abundant number, since it is smaller than the sum of its proper divisors (29238872).

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

28418728 is a wasteful number, since it uses less digits than its factorization.

28418728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1321 (or 1317 counting only the distinct ones).

The product of its digits is 57344, while the sum is 40.

The square root of 28418728 is about 5330.9218714965. The cubic root of 28418728 is about 305.1651099218.

The spelling of 28418728 in words is "twenty-eight million, four hundred eighteen thousand, seven hundred twenty-eight".