28263604 has 12 divisors (see below), whose sum is σ = 49660128. Its totient is φ = 14075000.

The previous prime is 28263601. The next prime is 28263617. The reversal of 28263604 is 40636282.

It is a super-2 number, since 2×28263604² = 1597662622137632, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28263601) 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 in 3 ways as a sum of consecutive naturals, for example, 13072 + ... + 15079.

It is an arithmetic number, because the mean of its divisors is an integer number (4138344).

Almost surely, 2^28263604 is an apocalyptic number.

It is an amenable number.

28263604 is a deficient number, since it is larger than the sum of its proper divisors (21396524).

28263604 is a wasteful number, since it uses less digits than its factorization.

28263604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28406 (or 28404 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 31.

The square root of 28263604 is about 5316.3525090046. The cubic root of 28263604 is about 304.6088473151.

Adding to 28263604 its reverse (40636282), we get a palindrome (68899886).

The spelling of 28263604 in words is "twenty-eight million, two hundred sixty-three thousand, six hundred four".