28126661 has 2 divisors, whose sum is σ = 28126662. Its totient is φ = 28126660.

The previous prime is 28126649. The next prime is 28126691. The reversal of 28126661 is 16662182.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25300900 + 2825761 = 5030^2 + 1681^2 .

It is a cyclic number.

It is not a de Polignac number, because 28126661 - 2⁶ = 28126597 is a prime.

It is a super-2 number, since 2×28126661² = 1582218118017842, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28126691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14063330 + 14063331.

It is an arithmetic number, because the mean of its divisors is an integer number (14063331).

Almost surely, 2^28126661 is an apocalyptic number.

It is an amenable number.

28126661 is a deficient number, since it is larger than the sum of its proper divisors (1).

28126661 is an equidigital number, since it uses as much as digits as its factorization.

28126661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6912, while the sum is 32.

The square root of 28126661 is about 5303.4574571689. The cubic root of 28126661 is about 304.1160863497.

The spelling of 28126661 in words is "twenty-eight million, one hundred twenty-six thousand, six hundred sixty-one".