28707551 has 2 divisors, whose sum is σ = 28707552. Its totient is φ = 28707550.

The previous prime is 28707529. The next prime is 28707559. The reversal of 28707551 is 15570782.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28707551 - 2⁶ = 28707487 is a prime.

It is equal to p_1782683 and since 28707551 and 1782683 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28707559) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14353775 + 14353776.

It is an arithmetic number, because the mean of its divisors is an integer number (14353776).

Almost surely, 2^28707551 is an apocalyptic number.

28707551 is a deficient number, since it is larger than the sum of its proper divisors (1).

28707551 is an equidigital number, since it uses as much as digits as its factorization.

28707551 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 19600, while the sum is 35.

The square root of 28707551 is about 5357.9427955140. The cubic root of 28707551 is about 306.1954373988.

The spelling of 28707551 in words is "twenty-eight million, seven hundred seven thousand, five hundred fifty-one".