28135803 has 8 divisors (see below), whose sum is σ = 38387008. Its totient is φ = 18320904.

The previous prime is 28135781. The next prime is 28135847. The reversal of 28135803 is 30853182.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 28135803 - 2¹² = 28131707 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28135853) 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, 108925 + ... + 109182.

It is an arithmetic number, because the mean of its divisors is an integer number (4798376).

Almost surely, 2^28135803 is an apocalyptic number.

28135803 is a deficient number, since it is larger than the sum of its proper divisors (10251205).

28135803 is a wasteful number, since it uses less digits than its factorization.

28135803 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 218153.

The product of its (nonzero) digits is 5760, while the sum is 30.

The square root of 28135803 is about 5304.3192777208. The cubic root of 28135803 is about 304.1490317000.

Adding to 28135803 its reverse (30853182), we get a palindrome (58988985).

The spelling of 28135803 in words is "twenty-eight million, one hundred thirty-five thousand, eight hundred three".