28206887377 has 2 divisors, whose sum is σ = 28206887378. Its totient is φ = 28206887376.

The previous prime is 28206887327. The next prime is 28206887431. The reversal of 28206887377 is 77378860282.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16537702801 + 11669184576 = 128599^2 + 108024^2 .

It is a cyclic number.

It is not a de Polignac number, because 28206887377 - 2³¹ = 26059403729 is a prime.

It is not a weakly prime, because it can be changed into another prime (28206887327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14103443688 + 14103443689.

It is an arithmetic number, because the mean of its divisors is an integer number (14103443689).

Almost surely, 2^28206887377 is an apocalyptic number.

It is an amenable number.

28206887377 is a deficient number, since it is larger than the sum of its proper divisors (1).

28206887377 is an equidigital number, since it uses as much as digits as its factorization.

28206887377 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12644352, while the sum is 58.

The spelling of 28206887377 in words is "twenty-eight billion, two hundred six million, eight hundred eighty-seven thousand, three hundred seventy-seven".