28451669 has 2 divisors, whose sum is σ = 28451670. Its totient is φ = 28451668.

The previous prime is 28451651. The next prime is 28451671. The reversal of 28451669 is 96615482.

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., 21743569 + 6708100 = 4663^2 + 2590^2 .

It is a cyclic number.

It is not a de Polignac number, because 28451669 - 2⁸ = 28451413 is a prime.

It is a super-2 number, since 2×28451669² = 1618994937771122, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 28451671, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28451369) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14225834 + 14225835.

It is an arithmetic number, because the mean of its divisors is an integer number (14225835).

Almost surely, 2^28451669 is an apocalyptic number.

It is an amenable number.

28451669 is a deficient number, since it is larger than the sum of its proper divisors (1).

28451669 is an equidigital number, since it uses as much as digits as its factorization.

28451669 is an evil number, because the sum of its binary digits is even.

The product of its digits is 103680, while the sum is 41.

The square root of 28451669 is about 5334.0105924154. The cubic root of 28451669 is about 305.2829730712.

The spelling of 28451669 in words is "twenty-eight million, four hundred fifty-one thousand, six hundred sixty-nine".