28140401 has 2 divisors, whose sum is σ = 28140402. Its totient is φ = 28140400.

The previous prime is 28140383. The next prime is 28140419. The reversal of 28140401 is 10404182.

It is a balanced prime because it is at equal distance from previous prime (28140383) and next prime (28140419).

It can be written as a sum of positive squares in only one way, i.e., 27040000 + 1100401 = 5200^2 + 1049^2 .

It is a cyclic number.

It is not a de Polignac number, because 28140401 - 2¹⁴ = 28124017 is a prime.

It is not a weakly prime, because it can be changed into another prime (28146401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14070200 + 14070201.

It is an arithmetic number, because the mean of its divisors is an integer number (14070201).

Almost surely, 2^28140401 is an apocalyptic number.

It is an amenable number.

28140401 is a deficient number, since it is larger than the sum of its proper divisors (1).

28140401 is an equidigital number, since it uses as much as digits as its factorization.

28140401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 256, while the sum is 20.

The square root of 28140401 is about 5304.7526803801. The cubic root of 28140401 is about 304.1655989788.

Adding to 28140401 its reverse (10404182), we get a palindrome (38544583).

The spelling of 28140401 in words is "twenty-eight million, one hundred forty thousand, four hundred one".