678741646 has 8 divisors (see below), whose sum is σ = 1110668184. Its totient is φ = 308518920.

The previous prime is 678741629. The next prime is 678741667. The reversal of 678741646 is 646147876.

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

It is a self number, because there is not a number n which added to its sum of digits gives 678741646.

It is a congruent number.

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, 15425925 + ... + 15425968.

It is an arithmetic number, because the mean of its divisors is an integer number (138833523).

Almost surely, 2^678741646 is an apocalyptic number.

678741646 is a deficient number, since it is larger than the sum of its proper divisors (431926538).

678741646 is a wasteful number, since it uses less digits than its factorization.

678741646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30851906.

The product of its digits is 1354752, while the sum is 49.

The square root of 678741646 is about 26052.6706116667. The cubic root of 678741646 is about 878.8231712403.

The spelling of 678741646 in words is "six hundred seventy-eight million, seven hundred forty-one thousand, six hundred forty-six".