28328401 has 2 divisors, whose sum is σ = 28328402. Its totient is φ = 28328400.

The previous prime is 28328393. The next prime is 28328407. The reversal of 28328401 is 10482382.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26532801 + 1795600 = 5151^2 + 1340^2 .

It is a cyclic number.

It is not a de Polignac number, because 28328401 - 2³ = 28328393 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28328401.

It is not a weakly prime, because it can be changed into another prime (28328407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14164200 + 14164201.

It is an arithmetic number, because the mean of its divisors is an integer number (14164201).

Almost surely, 2^28328401 is an apocalyptic number.

It is an amenable number.

28328401 is a deficient number, since it is larger than the sum of its proper divisors (1).

28328401 is an equidigital number, since it uses as much as digits as its factorization.

28328401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3072, while the sum is 28.

The square root of 28328401 is about 5322.4431420166. The cubic root of 28328401 is about 304.8414512335.

The spelling of 28328401 in words is "twenty-eight million, three hundred twenty-eight thousand, four hundred one".