28004236 has 48 divisors (see below), whose sum is σ = 56730240. Its totient is φ = 11980800.

The previous prime is 28004231. The next prime is 28004237. The reversal of 28004236 is 63240082.

28004236 = T₂₅₃ + T₂₅₄ + ... + T₅₆₈.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 28004236.

It is not an unprimeable number, because it can be changed into a prime (28004231) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 69636 + ... + 70036.

It is an arithmetic number, because the mean of its divisors is an integer number (1181880).

Almost surely, 2^28004236 is an apocalyptic number.

28004236 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

28004236 is an abundant number, since it is smaller than the sum of its proper divisors (28726004).

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

28004236 is a wasteful number, since it uses less digits than its factorization.

28004236 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 514 (or 512 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 25.

The square root of 28004236 is about 5291.9028713687. The cubic root of 28004236 is about 303.6742094998.

The spelling of 28004236 in words is "twenty-eight million, four thousand, two hundred thirty-six".