678276961 has 2 divisors, whose sum is σ = 678276962. Its totient is φ = 678276960.

The previous prime is 678276917. The next prime is 678276983. The reversal of 678276961 is 169672876.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 661466961 + 16810000 = 25719^2 + 4100^2 .

It is a cyclic number.

It is not a de Polignac number, because 678276961 - 2²³ = 669888353 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 678276899 and 678276908.

It is not a weakly prime, because it can be changed into another prime (678276461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 339138480 + 339138481.

It is an arithmetic number, because the mean of its divisors is an integer number (339138481).

Almost surely, 2^678276961 is an apocalyptic number.

It is an amenable number.

678276961 is a deficient number, since it is larger than the sum of its proper divisors (1).

678276961 is an equidigital number, since it uses as much as digits as its factorization.

678276961 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1524096, while the sum is 52.

The square root of 678276961 is about 26043.7509011279. The cubic root of 678276961 is about 878.6225700354.

The spelling of 678276961 in words is "six hundred seventy-eight million, two hundred seventy-six thousand, nine hundred sixty-one".