780747061 has 2 divisors, whose sum is σ = 780747062. Its totient is φ = 780747060.

The previous prime is 780746999. The next prime is 780747089. The reversal of 780747061 is 160747087.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 778744836 + 2002225 = 27906^2 + 1415^2 .

It is a cyclic number.

It is not a de Polignac number, because 780747061 - 2⁷ = 780746933 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (780747361) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 390373530 + 390373531.

It is an arithmetic number, because the mean of its divisors is an integer number (390373531).

Almost surely, 2^780747061 is an apocalyptic number.

It is an amenable number.

780747061 is a deficient number, since it is larger than the sum of its proper divisors (1).

780747061 is an equidigital number, since it uses as much as digits as its factorization.

780747061 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 65856, while the sum is 40.

The square root of 780747061 is about 27941.8514239841. The cubic root of 780747061 is about 920.8101956354.

The spelling of 780747061 in words is "seven hundred eighty million, seven hundred forty-seven thousand, sixty-one".