28002777977 has 2 divisors, whose sum is σ = 28002777978. Its totient is φ = 28002777976.

The previous prime is 28002777947. The next prime is 28002778019. The reversal of 28002777977 is 77977720082.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23634757696 + 4368020281 = 153736^2 + 66091^2 .

It is a cyclic number.

It is not a de Polignac number, because 28002777977 - 2¹⁴ = 28002761593 is a prime.

It is not a weakly prime, because it can be changed into another prime (28002777937) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14001388988 + 14001388989.

It is an arithmetic number, because the mean of its divisors is an integer number (14001388989).

Almost surely, 2^28002777977 is an apocalyptic number.

It is an amenable number.

28002777977 is a deficient number, since it is larger than the sum of its proper divisors (1).

28002777977 is an equidigital number, since it uses as much as digits as its factorization.

28002777977 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4840416, while the sum is 56.

The spelling of 28002777977 in words is "twenty-eight billion, two million, seven hundred seventy-seven thousand, nine hundred seventy-seven".