28438608157 has 2 divisors, whose sum is σ = 28438608158. Its totient is φ = 28438608156.

The previous prime is 28438608071. The next prime is 28438608173. The reversal of 28438608157 is 75180683482.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27799226361 + 639381796 = 166731^2 + 25286^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28438608157 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28438605157) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14219304078 + 14219304079.

It is an arithmetic number, because the mean of its divisors is an integer number (14219304079).

Almost surely, 2^28438608157 is an apocalyptic number.

It is an amenable number.

28438608157 is a deficient number, since it is larger than the sum of its proper divisors (1).

28438608157 is an equidigital number, since it uses as much as digits as its factorization.

28438608157 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2580480, while the sum is 52.

The spelling of 28438608157 in words is "twenty-eight billion, four hundred thirty-eight million, six hundred eight thousand, one hundred fifty-seven".