28196401 has 2 divisors, whose sum is σ = 28196402. Its totient is φ = 28196400.

The previous prime is 28196369. The next prime is 28196407. The reversal of 28196401 is 10469182.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17007376 + 11189025 = 4124^2 + 3345^2 .

It is a cyclic number.

It is not a de Polignac number, because 28196401 - 2⁵ = 28196369 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (28196407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14098200 + 14098201.

It is an arithmetic number, because the mean of its divisors is an integer number (14098201).

Almost surely, 2^28196401 is an apocalyptic number.

It is an amenable number.

28196401 is a deficient number, since it is larger than the sum of its proper divisors (1).

28196401 is an equidigital number, since it uses as much as digits as its factorization.

28196401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456, while the sum is 31.

The square root of 28196401 is about 5310.0283426739. The cubic root of 28196401 is about 304.3672306371.

The spelling of 28196401 in words is "twenty-eight million, one hundred ninety-six thousand, four hundred one".