28781403 has 16 divisors (see below), whose sum is σ = 43968000. Its totient is φ = 16405056.

The previous prime is 28781387. The next prime is 28781429. The reversal of 28781403 is 30418782.

It is not a de Polignac number, because 28781403 - 2⁴ = 28781387 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28781453) 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, 8098 + ... + 11096.

It is an arithmetic number, because the mean of its divisors is an integer number (2748000).

Almost surely, 2^28781403 is an apocalyptic number.

28781403 is a deficient number, since it is larger than the sum of its proper divisors (15186597).

28781403 is a wasteful number, since it uses less digits than its factorization.

28781403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3466.

The product of its (nonzero) digits is 10752, while the sum is 33.

The square root of 28781403 is about 5364.8301930257. The cubic root of 28781403 is about 306.4577816377.

The spelling of 28781403 in words is "twenty-eight million, seven hundred eighty-one thousand, four hundred three".