28757207 has 2 divisors, whose sum is σ = 28757208. Its totient is φ = 28757206.

The previous prime is 28757173. The next prime is 28757231. The reversal of 28757207 is 70275782.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28757207 - 2¹⁰ = 28756183 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28757297) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14378603 + 14378604.

It is an arithmetic number, because the mean of its divisors is an integer number (14378604).

Almost surely, 2^28757207 is an apocalyptic number.

28757207 is a deficient number, since it is larger than the sum of its proper divisors (1).

28757207 is an equidigital number, since it uses as much as digits as its factorization.

28757207 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 54880, while the sum is 38.

The square root of 28757207 is about 5362.5746614849. The cubic root of 28757207 is about 306.3718797406.

The spelling of 28757207 in words is "twenty-eight million, seven hundred fifty-seven thousand, two hundred seven".