678219139 has 12 divisors (see below), whose sum is σ = 754258656. Its totient is φ = 609122592.

The previous prime is 678219137. The next prime is 678219151. The reversal of 678219139 is 931912876.

It is a happy number.

It is not a de Polignac number, because 678219139 - 2¹ = 678219137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (678219133) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 47979 + ... + 60484.

It is an arithmetic number, because the mean of its divisors is an integer number (62854888).

Almost surely, 2^678219139 is an apocalyptic number.

678219139 is a deficient number, since it is larger than the sum of its proper divisors (76039517).

678219139 is a wasteful number, since it uses less digits than its factorization.

678219139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108526 (or 108513 counting only the distinct ones).

The product of its digits is 163296, while the sum is 46.

The square root of 678219139 is about 26042.6407839144. The cubic root of 678219139 is about 878.5976022809.

It can be divided in two parts, 6782 and 19139, that added together give a square (25921 = 161²).

The spelling of 678219139 in words is "six hundred seventy-eight million, two hundred nineteen thousand, one hundred thirty-nine".