28730612257 has 2 divisors, whose sum is σ = 28730612258. Its totient is φ = 28730612256.

The previous prime is 28730612203. The next prime is 28730612297. The reversal of 28730612257 is 75221603782.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26964595681 + 1766016576 = 164209^2 + 42024^2 .

It is a cyclic number.

It is not a de Polignac number, because 28730612257 - 2⁷ = 28730612129 is a prime.

It is not a weakly prime, because it can be changed into another prime (28730612297) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14365306128 + 14365306129.

It is an arithmetic number, because the mean of its divisors is an integer number (14365306129).

Almost surely, 2^28730612257 is an apocalyptic number.

It is an amenable number.

28730612257 is a deficient number, since it is larger than the sum of its proper divisors (1).

28730612257 is an equidigital number, since it uses as much as digits as its factorization.

28730612257 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 282240, while the sum is 43.

The spelling of 28730612257 in words is "twenty-eight billion, seven hundred thirty million, six hundred twelve thousand, two hundred fifty-seven".