868472777 has 2 divisors, whose sum is σ = 868472778. Its totient is φ = 868472776.

The previous prime is 868472771. The next prime is 868472789. The reversal of 868472777 is 777274868.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 728784016 + 139688761 = 26996^2 + 11819^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-868472777 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (868472771) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 434236388 + 434236389.

It is an arithmetic number, because the mean of its divisors is an integer number (434236389).

Almost surely, 2^868472777 is an apocalyptic number.

It is an amenable number.

868472777 is a deficient number, since it is larger than the sum of its proper divisors (1).

868472777 is an equidigital number, since it uses as much as digits as its factorization.

868472777 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7375872, while the sum is 56.

The square root of 868472777 is about 29469.8621815576. The cubic root of 868472777 is about 954.0813427675.

The spelling of 868472777 in words is "eight hundred sixty-eight million, four hundred seventy-two thousand, seven hundred seventy-seven".