28471669 has 2 divisors, whose sum is σ = 28471670. Its totient is φ = 28471668.

The previous prime is 28471661. The next prime is 28471673. The reversal of 28471669 is 96617482.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17114769 + 11356900 = 4137^2 + 3370^2 .

It is a cyclic number.

It is not a de Polignac number, because 28471669 - 2³ = 28471661 is a prime.

It is a super-3 number, since 3×28471669³ (a number of 23 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28471661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14235834 + 14235835.

It is an arithmetic number, because the mean of its divisors is an integer number (14235835).

Almost surely, 2^28471669 is an apocalyptic number.

It is an amenable number.

28471669 is a deficient number, since it is larger than the sum of its proper divisors (1).

28471669 is an equidigital number, since it uses as much as digits as its factorization.

28471669 is an evil number, because the sum of its binary digits is even.

The product of its digits is 145152, while the sum is 43.

The square root of 28471669 is about 5335.8850249982. The cubic root of 28471669 is about 305.3544888450.

The spelling of 28471669 in words is "twenty-eight million, four hundred seventy-one thousand, six hundred sixty-nine".