28471309777 has 2 divisors, whose sum is σ = 28471309778. Its totient is φ = 28471309776.

The previous prime is 28471309771. The next prime is 28471309781. The reversal of 28471309777 is 77790317482.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19369958976 + 9101350801 = 139176^2 + 95401^2 .

It is a cyclic number.

It is not a de Polignac number, because 28471309777 - 2¹¹ = 28471307729 is a prime.

It is not a weakly prime, because it can be changed into another prime (28471309771) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14235654888 + 14235654889.

It is an arithmetic number, because the mean of its divisors is an integer number (14235654889).

Almost surely, 2^28471309777 is an apocalyptic number.

It is an amenable number.

28471309777 is a deficient number, since it is larger than the sum of its proper divisors (1).

28471309777 is an equidigital number, since it uses as much as digits as its factorization.

28471309777 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4148928, while the sum is 55.

The spelling of 28471309777 in words is "twenty-eight billion, four hundred seventy-one million, three hundred nine thousand, seven hundred seventy-seven".