28078734157 has 2 divisors, whose sum is σ = 28078734158. Its totient is φ = 28078734156.

The previous prime is 28078734139. The next prime is 28078734197. The reversal of 28078734157 is 75143787082.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26009303076 + 2069431081 = 161274^2 + 45491^2 .

It is a cyclic number.

It is not a de Polignac number, because 28078734157 - 2²⁷ = 27944516429 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28078734197) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14039367078 + 14039367079.

It is an arithmetic number, because the mean of its divisors is an integer number (14039367079).

Almost surely, 2^28078734157 is an apocalyptic number.

It is an amenable number.

28078734157 is a deficient number, since it is larger than the sum of its proper divisors (1).

28078734157 is an equidigital number, since it uses as much as digits as its factorization.

28078734157 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2634240, while the sum is 52.

The spelling of 28078734157 in words is "twenty-eight billion, seventy-eight million, seven hundred thirty-four thousand, one hundred fifty-seven".