28263401 has 4 divisors (see below), whose sum is σ = 29925972. Its totient is φ = 26600832.

The previous prime is 28263383. The next prime is 28263407. The reversal of 28263401 is 10436282.

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 11256025 + 17007376 = 3355^2 + 4124^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28263401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28263407) 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, 831260 + ... + 831293.

It is an arithmetic number, because the mean of its divisors is an integer number (7481493).

Almost surely, 2^28263401 is an apocalyptic number.

It is an amenable number.

28263401 is a deficient number, since it is larger than the sum of its proper divisors (1662571).

28263401 is a wasteful number, since it uses less digits than its factorization.

28263401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1662570.

The product of its (nonzero) digits is 2304, while the sum is 26.

The square root of 28263401 is about 5316.3334169331. Note that the first 3 decimals coincide. The cubic root of 28263401 is about 304.6081180410.

Adding to 28263401 its reverse (10436282), we get a palindrome (38699683).

The spelling of 28263401 in words is "twenty-eight million, two hundred sixty-three thousand, four hundred one".