28553636 has 6 divisors (see below), whose sum is σ = 49968870. Its totient is φ = 14276816.

The previous prime is 28553633. The next prime is 28553639. The reversal of 28553636 is 63635582.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (28553633) and next prime (28553639).

It can be written as a sum of positive squares in only one way, i.e., 23580736 + 4972900 = 4856^2 + 2230^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 28553636.

It is not an unprimeable number, because it can be changed into a prime (28553633) 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, 3569201 + ... + 3569208.

It is an arithmetic number, because the mean of its divisors is an integer number (8328145).

Almost surely, 2^28553636 is an apocalyptic number.

It is an amenable number.

28553636 is a deficient number, since it is larger than the sum of its proper divisors (21415234).

28553636 is a wasteful number, since it uses less digits than its factorization.

28553636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7138413 (or 7138411 counting only the distinct ones).

The product of its digits is 129600, while the sum is 38.

The square root of 28553636 is about 5343.5602363967. The cubic root of 28553636 is about 305.6472361265.

The spelling of 28553636 in words is "twenty-eight million, five hundred fifty-three thousand, six hundred thirty-six".