28403101 has 4 divisors (see below), whose sum is σ = 28454652. Its totient is φ = 28351552.

The previous prime is 28403083. The next prime is 28403113. The reversal of 28403101 is 10130482.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1092025 + 27311076 = 1045^2 + 5226^2 .

It is a cyclic number.

It is not a de Polignac number, because 28403101 - 2⁵ = 28403069 is a prime.

It is a super-2 number, since 2×28403101² = 1613472292832402, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28403171) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24940 + ... + 26053.

It is an arithmetic number, because the mean of its divisors is an integer number (7113663).

Almost surely, 2^28403101 is an apocalyptic number.

It is an amenable number.

28403101 is a deficient number, since it is larger than the sum of its proper divisors (51551).

28403101 is an equidigital number, since it uses as much as digits as its factorization.

28403101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51550.

The product of its (nonzero) digits is 192, while the sum is 19.

The square root of 28403101 is about 5329.4559759885. The cubic root of 28403101 is about 305.1091645426.

Adding to 28403101 its reverse (10130482), we get a palindrome (38533583).

The spelling of 28403101 in words is "twenty-eight million, four hundred three thousand, one hundred one".