28372397 has 2 divisors, whose sum is σ = 28372398. Its totient is φ = 28372396.

The previous prime is 28372387. The next prime is 28372417. The reversal of 28372397 is 79327382.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26977636 + 1394761 = 5194^2 + 1181^2 .

It is a cyclic number.

It is not a de Polignac number, because 28372397 - 2¹⁰ = 28371373 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28372387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14186198 + 14186199.

It is an arithmetic number, because the mean of its divisors is an integer number (14186199).

Almost surely, 2^28372397 is an apocalyptic number.

It is an amenable number.

28372397 is a deficient number, since it is larger than the sum of its proper divisors (1).

28372397 is an equidigital number, since it uses as much as digits as its factorization.

28372397 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 127008, while the sum is 41.

The square root of 28372397 is about 5326.5746028757. The cubic root of 28372397 is about 304.9991830131. Note that the first 3 decimals are identical.

The spelling of 28372397 in words is "twenty-eight million, three hundred seventy-two thousand, three hundred ninety-seven".