28741649 has 2 divisors, whose sum is σ = 28741650. Its totient is φ = 28741648.

The previous prime is 28741631. The next prime is 28741729. The reversal of 28741649 is 94614782.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25573249 + 3168400 = 5057^2 + 1780^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28741649 is a prime.

It is a super-3 number, since 3×28741649³ (a number of 23 digits) contains 333 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (28746649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14370824 + 14370825.

It is an arithmetic number, because the mean of its divisors is an integer number (14370825).

Almost surely, 2^28741649 is an apocalyptic number.

It is an amenable number.

28741649 is a deficient number, since it is larger than the sum of its proper divisors (1).

28741649 is an equidigital number, since it uses as much as digits as its factorization.

28741649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 96768, while the sum is 41.

The square root of 28741649 is about 5361.1238560585. The cubic root of 28741649 is about 306.3166194651.

The spelling of 28741649 in words is "twenty-eight million, seven hundred forty-one thousand, six hundred forty-nine".