778061 has 2 divisors, whose sum is σ = 778062. Its totient is φ = 778060.

The previous prime is 778051. The next prime is 778079. The reversal of 778061 is 160877.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 609961 + 168100 = 781^2 + 410^2 .

It is an emirp because it is prime and its reverse (160877) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 778061 - 2¹⁸ = 515917 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (778051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 389030 + 389031.

It is an arithmetic number, because the mean of its divisors is an integer number (389031).

2⁷⁷⁸⁰⁶¹ is an apocalyptic number.

It is an amenable number.

778061 is a deficient number, since it is larger than the sum of its proper divisors (1).

778061 is an equidigital number, since it uses as much as digits as its factorization.

778061 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2352, while the sum is 29.

The square root of 778061 is about 882.0776609800. The cubic root of 778061 is about 91.9753005528.

The spelling of 778061 in words is "seven hundred seventy-eight thousand, sixty-one".