28126649 has 2 divisors, whose sum is σ = 28126650. Its totient is φ = 28126648.

The previous prime is 28126643. The next prime is 28126661. The reversal of 28126649 is 94662182.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25321024 + 2805625 = 5032^2 + 1675^2 .

It is a cyclic number.

It is not a de Polignac number, because 28126649 - 2²⁴ = 11349433 is a prime.

It is a super-2 number, since 2×28126649² = 1582216767938402, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (28126643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14063324 + 14063325.

It is an arithmetic number, because the mean of its divisors is an integer number (14063325).

Almost surely, 2^28126649 is an apocalyptic number.

It is an amenable number.

28126649 is a deficient number, since it is larger than the sum of its proper divisors (1).

28126649 is an equidigital number, since it uses as much as digits as its factorization.

28126649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 41472, while the sum is 38.

The square root of 28126649 is about 5303.4563258313. The cubic root of 28126649 is about 304.1160431002.

The spelling of 28126649 in words is "twenty-eight million, one hundred twenty-six thousand, six hundred forty-nine".