28203136 has 64 divisors (see below), whose sum is σ = 64131480. Its totient is φ = 12238848.

The previous prime is 28203107. The next prime is 28203137. The reversal of 28203136 is 63130282.

It can be written as a sum of positive squares in 4 ways, for example, as 26625600 + 1577536 = 5160^2 + 1256^2 .

It is a tau number, because it is divible by the number of its divisors (64).

It is a self number, because there is not a number n which added to its sum of digits gives 28203136.

It is not an unprimeable number, because it can be changed into a prime (28203137) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27790 + ... + 28786.

Almost surely, 2^28203136 is an apocalyptic number.

28203136 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28203136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32065740).

28203136 is an abundant number, since it is smaller than the sum of its proper divisors (35928344).

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

28203136 is a wasteful number, since it uses less digits than its factorization.

28203136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1041 (or 1029 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 28203136 is about 5310.6624822144. The cubic root of 28203136 is about 304.3914624543.

The spelling of 28203136 in words is "twenty-eight million, two hundred three thousand, one hundred thirty-six".