28811403 has 12 divisors (see below), whose sum is σ = 42724920. Its totient is φ = 19189008.

The previous prime is 28811401. The next prime is 28811441. The reversal of 28811403 is 30411882.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It is not a de Polignac number, because 28811403 - 2¹ = 28811401 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (28811401) 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 11 ways as a sum of consecutive naturals, for example, 27375 + ... + 28407.

It is an arithmetic number, because the mean of its divisors is an integer number (3560410).

Almost surely, 2^28811403 is an apocalyptic number.

28811403 is a deficient number, since it is larger than the sum of its proper divisors (13913517).

28811403 is an frugal number, since it uses more digits than its factorization.

28811403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2075 (or 1036 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 27.

The square root of 28811403 is about 5367.6254526560. The cubic root of 28811403 is about 306.5642223715.

Multiplying 28811403 by its sum of digits (27), we get a square (777907881 = 27891²).

28811403 divided by its sum of digits (27) gives a square (1067089 = 1033²).

The spelling of 28811403 in words is "twenty-eight million, eight hundred eleven thousand, four hundred three".