28405544 has 8 divisors (see below), whose sum is σ = 53260410. Its totient is φ = 14202768.

The previous prime is 28405523. The next prime is 28405549. The reversal of 28405544 is 44550482.

It can be written as a sum of positive squares in only one way, i.e., 25300900 + 3104644 = 5030^2 + 1762^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 28405544.

It is not an unprimeable number, because it can be changed into a prime (28405549) 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, 1775339 + ... + 1775354.

Almost surely, 2^28405544 is an apocalyptic number.

It is an amenable number.

28405544 is a deficient number, since it is larger than the sum of its proper divisors (24854866).

28405544 is a wasteful number, since it uses less digits than its factorization.

28405544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3550699 (or 3550695 counting only the distinct ones).

The product of its (nonzero) digits is 25600, while the sum is 32.

The square root of 28405544 is about 5329.6851689382. The cubic root of 28405544 is about 305.1179119481.

The spelling of 28405544 in words is "twenty-eight million, four hundred five thousand, five hundred forty-four".