678987461 has 2 divisors, whose sum is σ = 678987462. Its totient is φ = 678987460.

The previous prime is 678987443. The next prime is 678987479. The reversal of 678987461 is 164789876.

It is a balanced prime because it is at equal distance from previous prime (678987443) and next prime (678987479).

It can be written as a sum of positive squares in only one way, i.e., 668222500 + 10764961 = 25850^2 + 3281^2 .

It is a cyclic number.

It is not a de Polignac number, because 678987461 - 2¹⁰ = 678986437 is a prime.

It is a super-2 number, since 2×678987461² = 922047944390453042, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 678987397 and 678987406.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (678987161) 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, 339493730 + 339493731.

It is an arithmetic number, because the mean of its divisors is an integer number (339493731).

Almost surely, 2^678987461 is an apocalyptic number.

It is an amenable number.

678987461 is a deficient number, since it is larger than the sum of its proper divisors (1).

678987461 is an equidigital number, since it uses as much as digits as its factorization.

678987461 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4064256, while the sum is 56.

The square root of 678987461 is about 26057.3878391523. The cubic root of 678987461 is about 878.9292507995.

The spelling of 678987461 in words is "six hundred seventy-eight million, nine hundred eighty-seven thousand, four hundred sixty-one".