678945619 has 8 divisors (see below), whose sum is σ = 757893312. Its totient is φ = 602868840.

The previous prime is 678945607. The next prime is 678945637. The reversal of 678945619 is 916549876.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 678945619 - 2¹⁵ = 678912851 is a prime.

It is a super-2 number, since 2×678945619² = 921934307118586322, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 678945619.

It is not an unprimeable number, because it can be changed into a prime (678945719) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 717229 + ... + 718174.

It is an arithmetic number, because the mean of its divisors is an integer number (94736664).

Almost surely, 2^678945619 is an apocalyptic number.

678945619 is a deficient number, since it is larger than the sum of its proper divisors (78947693).

678945619 is a wasteful number, since it uses less digits than its factorization.

678945619 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1435457.

The product of its digits is 3265920, while the sum is 55.

The square root of 678945619 is about 26056.5849450767. The cubic root of 678945619 is about 878.9111960168.

The spelling of 678945619 in words is "six hundred seventy-eight million, nine hundred forty-five thousand, six hundred nineteen".