678615641 has 8 divisors (see below), whose sum is σ = 758364768. Its totient is φ = 601876000.

The previous prime is 678615629. The next prime is 678615649. The reversal of 678615641 is 146516876.

678615641 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 678615641 - 2¹⁰ = 678614617 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 678615592 and 678615601.

It is not an unprimeable number, because it can be changed into a prime (678615649) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 751895 + ... + 752796.

It is an arithmetic number, because the mean of its divisors is an integer number (94795596).

Almost surely, 2^678615641 is an apocalyptic number.

It is an amenable number.

678615641 is a deficient number, since it is larger than the sum of its proper divisors (79749127).

678615641 is a wasteful number, since it uses less digits than its factorization.

678615641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1504743.

The product of its digits is 241920, while the sum is 44.

The square root of 678615641 is about 26050.2522252665. The cubic root of 678615641 is about 878.7687848290.

The spelling of 678615641 in words is "six hundred seventy-eight million, six hundred fifteen thousand, six hundred forty-one".