28775401 has 2 divisors, whose sum is σ = 28775402. Its totient is φ = 28775400.

The previous prime is 28775389. The next prime is 28775413. The reversal of 28775401 is 10457782.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (28775389) and next prime (28775413).

It can be written as a sum of positive squares in only one way, i.e., 15642025 + 13133376 = 3955^2 + 3624^2 .

It is a cyclic number.

It is not a de Polignac number, because 28775401 - 2⁷ = 28775273 is a prime.

It is not a weakly prime, because it can be changed into another prime (28775491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14387700 + 14387701.

It is an arithmetic number, because the mean of its divisors is an integer number (14387701).

Almost surely, 2^28775401 is an apocalyptic number.

It is an amenable number.

28775401 is a deficient number, since it is larger than the sum of its proper divisors (1).

28775401 is an equidigital number, since it uses as much as digits as its factorization.

28775401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15680, while the sum is 34.

The square root of 28775401 is about 5364.2707798917. The cubic root of 28775401 is about 306.4364775167.

The spelling of 28775401 in words is "twenty-eight million, seven hundred seventy-five thousand, four hundred one".