28620554777 has 2 divisors, whose sum is σ = 28620554778. Its totient is φ = 28620554776.

The previous prime is 28620554741. The next prime is 28620554801. The reversal of 28620554777 is 77745502682.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16287119641 + 12333435136 = 127621^2 + 111056^2 .

It is a cyclic number.

It is not a de Polignac number, because 28620554777 - 2¹⁸ = 28620292633 is a prime.

It is not a weakly prime, because it can be changed into another prime (28620554707) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14310277388 + 14310277389.

It is an arithmetic number, because the mean of its divisors is an integer number (14310277389).

Almost surely, 2^28620554777 is an apocalyptic number.

It is an amenable number.

28620554777 is a deficient number, since it is larger than the sum of its proper divisors (1).

28620554777 is an equidigital number, since it uses as much as digits as its factorization.

28620554777 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6585600, while the sum is 53.

The spelling of 28620554777 in words is "twenty-eight billion, six hundred twenty million, five hundred fifty-four thousand, seven hundred seventy-seven".