678645481 has 2 divisors, whose sum is σ = 678645482. Its totient is φ = 678645480.

The previous prime is 678645437. The next prime is 678645503. The reversal of 678645481 is 184546876.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 394419600 + 284225881 = 19860^2 + 16859^2 .

It is a cyclic number.

It is not a de Polignac number, because 678645481 - 2¹⁹ = 678121193 is a prime.

It is a super-2 number, since 2×678645481² = 921119377763442722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (678645421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 339322740 + 339322741.

It is an arithmetic number, because the mean of its divisors is an integer number (339322741).

Almost surely, 2^678645481 is an apocalyptic number.

It is an amenable number.

678645481 is a deficient number, since it is larger than the sum of its proper divisors (1).

678645481 is an equidigital number, since it uses as much as digits as its factorization.

678645481 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1290240, while the sum is 49.

The square root of 678645481 is about 26050.8249581467. The cubic root of 678645481 is about 878.7816650097.

The spelling of 678645481 in words is "six hundred seventy-eight million, six hundred forty-five thousand, four hundred eighty-one".