28434820157 has 2 divisors, whose sum is σ = 28434820158. Its totient is φ = 28434820156.

The previous prime is 28434820133. The next prime is 28434820187. The reversal of 28434820157 is 75102843482.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18286071076 + 10148749081 = 135226^2 + 100741^2 .

It is a cyclic number.

It is not a de Polignac number, because 28434820157 - 2²⁴ = 28418042941 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28434820187) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14217410078 + 14217410079.

It is an arithmetic number, because the mean of its divisors is an integer number (14217410079).

Almost surely, 2^28434820157 is an apocalyptic number.

It is an amenable number.

28434820157 is a deficient number, since it is larger than the sum of its proper divisors (1).

28434820157 is an equidigital number, since it uses as much as digits as its factorization.

28434820157 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 430080, while the sum is 44.

The spelling of 28434820157 in words is "twenty-eight billion, four hundred thirty-four million, eight hundred twenty thousand, one hundred fifty-seven".