678212650 has 12 divisors (see below), whose sum is σ = 1261475622. Its totient is φ = 271285040.

The previous prime is 678212621. The next prime is 678212681. The reversal of 678212650 is 56212876.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 268271641 + 409941009 = 16379^2 + 20247^2 .

It is an unprimeable number.

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 in 5 ways as a sum of consecutive naturals, for example, 6782077 + ... + 6782176.

Almost surely, 2^678212650 is an apocalyptic number.

678212650 is a deficient number, since it is larger than the sum of its proper divisors (583262972).

678212650 is a wasteful number, since it uses less digits than its factorization.

678212650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13564265 (or 13564260 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 37.

The square root of 678212650 is about 26042.5161994766. The cubic root of 678212650 is about 878.5948002180.

The spelling of 678212650 in words is "six hundred seventy-eight million, two hundred twelve thousand, six hundred fifty".