780680977 has 2 divisors, whose sum is σ = 780680978. Its totient is φ = 780680976.

The previous prime is 780680969. The next prime is 780680993. The reversal of 780680977 is 779086087.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 778633216 + 2047761 = 27904^2 + 1431^2 .

It is a cyclic number.

It is not a de Polignac number, because 780680977 - 2³ = 780680969 is a prime.

It is not a weakly prime, because it can be changed into another prime (780687977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 390340488 + 390340489.

It is an arithmetic number, because the mean of its divisors is an integer number (390340489).

Almost surely, 2^780680977 is an apocalyptic number.

It is an amenable number.

780680977 is a deficient number, since it is larger than the sum of its proper divisors (1).

780680977 is an equidigital number, since it uses as much as digits as its factorization.

780680977 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1185408, while the sum is 52.

The square root of 780680977 is about 27940.6688717361. The cubic root of 780680977 is about 920.7842151606.

The spelling of 780680977 in words is "seven hundred eighty million, six hundred eighty thousand, nine hundred seventy-seven".