28667608477 has 2 divisors, whose sum is σ = 28667608478. Its totient is φ = 28667608476.

The previous prime is 28667608447. The next prime is 28667608511. The reversal of 28667608477 is 77480676682.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22506300441 + 6161308036 = 150021^2 + 78494^2 .

It is a cyclic number.

It is not a de Polignac number, because 28667608477 - 2¹⁵ = 28667575709 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28667608447) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14333804238 + 14333804239.

It is an arithmetic number, because the mean of its divisors is an integer number (14333804239).

Almost surely, 2^28667608477 is an apocalyptic number.

It is an amenable number.

28667608477 is a deficient number, since it is larger than the sum of its proper divisors (1).

28667608477 is an equidigital number, since it uses as much as digits as its factorization.

28667608477 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 37933056, while the sum is 61.

The spelling of 28667608477 in words is "twenty-eight billion, six hundred sixty-seven million, six hundred eight thousand, four hundred seventy-seven".