28219601 has 2 divisors, whose sum is σ = 28219602. Its totient is φ = 28219600.

The previous prime is 28219577. The next prime is 28219613. The reversal of 28219601 is 10691282.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21381376 + 6838225 = 4624^2 + 2615^2 .

It is a cyclic number.

It is not a de Polignac number, because 28219601 - 2²² = 24025297 is a prime.

It is not a weakly prime, because it can be changed into another prime (28219661) 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 as a sum of consecutive naturals, namely, 14109800 + 14109801.

It is an arithmetic number, because the mean of its divisors is an integer number (14109801).

Almost surely, 2^28219601 is an apocalyptic number.

It is an amenable number.

28219601 is a deficient number, since it is larger than the sum of its proper divisors (1).

28219601 is an equidigital number, since it uses as much as digits as its factorization.

28219601 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1728, while the sum is 29.

The square root of 28219601 is about 5312.2124392761. The cubic root of 28219601 is about 304.4506855427.

The spelling of 28219601 in words is "twenty-eight million, two hundred nineteen thousand, six hundred one".