28488404 has 18 divisors (see below), whose sum is σ = 57994650. Its totient is φ = 12209232.

The previous prime is 28488389. The next prime is 28488419. The reversal of 28488404 is 40488482.

It is an interprime number because it is at equal distance from previous prime (28488389) and next prime (28488419).

It can be written as a sum of positive squares in only one way, i.e., 21996100 + 6492304 = 4690^2 + 2548^2 .

It is a congruent number.

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, 72479 + ... + 72870.

It is an arithmetic number, because the mean of its divisors is an integer number (3221925).

Almost surely, 2^28488404 is an apocalyptic number.

It is an amenable number.

28488404 is an abundant number, since it is smaller than the sum of its proper divisors (29506246).

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

28488404 is a wasteful number, since it uses less digits than its factorization.

28488404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145367 (or 145358 counting only the distinct ones).

The product of its (nonzero) digits is 65536, while the sum is 38.

The square root of 28488404 is about 5337.4529506123. The cubic root of 28488404 is about 305.4143039369.

It can be divided in two parts, 284 and 88404, that added together give a palindrome (88688).

The spelling of 28488404 in words is "twenty-eight million, four hundred eighty-eight thousand, four hundred four".