28440738 has 12 divisors (see below), whose sum is σ = 61621638. Its totient is φ = 9480240.

The previous prime is 28440721. The next prime is 28440743. The reversal of 28440738 is 83704482.

It can be written as a sum of positive squares in only one way, i.e., 24532209 + 3908529 = 4953^2 + 1977^2 .

It is an unprimeable number.

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 in 5 ways as a sum of consecutive naturals, for example, 790003 + ... + 790038.

Almost surely, 2^28440738 is an apocalyptic number.

28440738 is an abundant number, since it is smaller than the sum of its proper divisors (33180900).

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

28440738 is a wasteful number, since it uses less digits than its factorization.

28440738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1580049 (or 1580046 counting only the distinct ones).

The product of its (nonzero) digits is 43008, while the sum is 36.

The square root of 28440738 is about 5332.9858428464. The cubic root of 28440738 is about 305.2438719599.

The spelling of 28440738 in words is "twenty-eight million, four hundred forty thousand, seven hundred thirty-eight".