76780961 has 2 divisors, whose sum is σ = 76780962. Its totient is φ = 76780960.

The previous prime is 76780937. The next prime is 76780973. The reversal of 76780961 is 16908767.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 48094225 + 28686736 = 6935^2 + 5356^2 .

It is a cyclic number.

It is not a de Polignac number, because 76780961 - 2⁶ = 76780897 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (76780981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38390480 + 38390481.

It is an arithmetic number, because the mean of its divisors is an integer number (38390481).

Almost surely, 2^76780961 is an apocalyptic number.

It is an amenable number.

76780961 is a deficient number, since it is larger than the sum of its proper divisors (1).

76780961 is an equidigital number, since it uses as much as digits as its factorization.

76780961 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 127008, while the sum is 44.

The square root of 76780961 is about 8762.4745934011. The cubic root of 76780961 is about 425.0282998456.

The spelling of 76780961 in words is "seventy-six million, seven hundred eighty thousand, nine hundred sixty-one".