28557535 has 12 divisors (see below), whose sum is σ = 36405288. Its totient is φ = 21501056.

The previous prime is 28557523. The next prime is 28557539. The reversal of 28557535 is 53575582.

It is a happy number.

It is not a de Polignac number, because 28557535 - 2²³ = 20168927 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28557539) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8437 + ... + 11326.

It is an arithmetic number, because the mean of its divisors is an integer number (3033774).

Almost surely, 2^28557535 is an apocalyptic number.

28557535 is a deficient number, since it is larger than the sum of its proper divisors (7847753).

28557535 is a wasteful number, since it uses less digits than its factorization.

28557535 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19802 (or 19785 counting only the distinct ones).

The product of its digits is 210000, while the sum is 40.

The square root of 28557535 is about 5343.9250556122. The cubic root of 28557535 is about 305.6611475403.

It can be divided in two parts, 28557 and 535, that added together give a palindrome (29092).

The spelling of 28557535 in words is "twenty-eight million, five hundred fifty-seven thousand, five hundred thirty-five".