28727401 has 4 divisors (see below), whose sum is σ = 29198404. Its totient is φ = 28256400.

The previous prime is 28727357. The next prime is 28727407. The reversal of 28727401 is 10472782.

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 1687401 + 27040000 = 1299^2 + 5200^2 .

It is a cyclic number.

It is not a de Polignac number, because 28727401 - 2¹¹ = 28725353 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28727407) 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 3 ways as a sum of consecutive naturals, for example, 235410 + ... + 235531.

It is an arithmetic number, because the mean of its divisors is an integer number (7299601).

Almost surely, 2^28727401 is an apocalyptic number.

It is an amenable number.

28727401 is a deficient number, since it is larger than the sum of its proper divisors (471003).

28727401 is an equidigital number, since it uses as much as digits as its factorization.

28727401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 471002.

The product of its (nonzero) digits is 6272, while the sum is 31.

The square root of 28727401 is about 5359.7948654776. The cubic root of 28727401 is about 306.2659946665.

The spelling of 28727401 in words is "twenty-eight million, seven hundred twenty-seven thousand, four hundred one".