28557707 has 2 divisors, whose sum is σ = 28557708. Its totient is φ = 28557706.

The previous prime is 28557701. The next prime is 28557731. The reversal of 28557707 is 70775582.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28557707 - 2⁶ = 28557643 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (28557701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14278853 + 14278854.

It is an arithmetic number, because the mean of its divisors is an integer number (14278854).

Almost surely, 2^28557707 is an apocalyptic number.

28557707 is a deficient number, since it is larger than the sum of its proper divisors (1).

28557707 is an equidigital number, since it uses as much as digits as its factorization.

28557707 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 137200, while the sum is 41.

The square root of 28557707 is about 5343.9411486280. The cubic root of 28557707 is about 305.6617611975.

The spelling of 28557707 in words is "twenty-eight million, five hundred fifty-seven thousand, seven hundred seven".