28621337 has 2 divisors, whose sum is σ = 28621338. Its totient is φ = 28621336.

The previous prime is 28621301. The next prime is 28621343. The reversal of 28621337 is 73312682.

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., 28558336 + 63001 = 5344^2 + 251^2 .

It is a cyclic number.

It is not a de Polignac number, because 28621337 - 2²² = 24427033 is a prime.

It is not a weakly prime, because it can be changed into another prime (28621357) 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, 14310668 + 14310669.

It is an arithmetic number, because the mean of its divisors is an integer number (14310669).

Almost surely, 2^28621337 is an apocalyptic number.

It is an amenable number.

28621337 is a deficient number, since it is larger than the sum of its proper divisors (1).

28621337 is an equidigital number, since it uses as much as digits as its factorization.

28621337 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12096, while the sum is 32.

The square root of 28621337 is about 5349.8913073071. The cubic root of 28621337 is about 305.8886098333. Note that the first 3 decimals are identical.

The spelling of 28621337 in words is "twenty-eight million, six hundred twenty-one thousand, three hundred thirty-seven".