28709357 has 2 divisors, whose sum is σ = 28709358. Its totient is φ = 28709356.

The previous prime is 28709327. The next prime is 28709363. The reversal of 28709357 is 75390782.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27573001 + 1136356 = 5251^2 + 1066^2 .

It is a cyclic number.

It is not a de Polignac number, because 28709357 - 2¹⁴ = 28692973 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28709327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14354678 + 14354679.

It is an arithmetic number, because the mean of its divisors is an integer number (14354679).

Almost surely, 2^28709357 is an apocalyptic number.

It is an amenable number.

28709357 is a deficient number, since it is larger than the sum of its proper divisors (1).

28709357 is an equidigital number, since it uses as much as digits as its factorization.

28709357 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 105840, while the sum is 41.

The square root of 28709357 is about 5358.1113276975. Note that the first 3 decimals coincide. The cubic root of 28709357 is about 306.2018582108.

The spelling of 28709357 in words is "twenty-eight million, seven hundred nine thousand, three hundred fifty-seven".