28401361 has 4 divisors (see below), whose sum is σ = 28882800. Its totient is φ = 27919924.

The previous prime is 28401341. The next prime is 28401379. The reversal of 28401361 is 16310482.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 28401361 - 2²¹ = 26304209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28401341) 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, 240631 + ... + 240748.

It is an arithmetic number, because the mean of its divisors is an integer number (7220700).

Almost surely, 2^28401361 is an apocalyptic number.

It is an amenable number.

28401361 is a deficient number, since it is larger than the sum of its proper divisors (481439).

28401361 is an equidigital number, since it uses as much as digits as its factorization.

28401361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 481438.

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 28401361 is about 5329.2927298095. The cubic root of 28401361 is about 305.1029339931.

The spelling of 28401361 in words is "twenty-eight million, four hundred one thousand, three hundred sixty-one".