678263545 has 4 divisors (see below), whose sum is σ = 813916260. Its totient is φ = 542610832.

The previous prime is 678263527. The next prime is 678263561. The reversal of 678263545 is 545362876.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 542144656 + 136118889 = 23284^2 + 11667^2 .

It is a cyclic number.

It is not a de Polignac number, because 678263545 - 2¹¹ = 678261497 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 678263495 and 678263504.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 67826350 + ... + 67826359.

It is an arithmetic number, because the mean of its divisors is an integer number (203479065).

Almost surely, 2^678263545 is an apocalyptic number.

It is an amenable number.

678263545 is a deficient number, since it is larger than the sum of its proper divisors (135652715).

678263545 is a wasteful number, since it uses less digits than its factorization.

678263545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135652714.

The product of its digits is 1209600, while the sum is 46.

The square root of 678263545 is about 26043.4933332685. The cubic root of 678263545 is about 878.6167770832.

The spelling of 678263545 in words is "six hundred seventy-eight million, two hundred sixty-three thousand, five hundred forty-five".