678620941 has 4 divisors (see below), whose sum is σ = 679970592. Its totient is φ = 677271292.

The previous prime is 678620933. The next prime is 678620963. The reversal of 678620941 is 149026876.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 678620941 - 2³ = 678620933 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (678620141) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 674071 + ... + 675076.

It is an arithmetic number, because the mean of its divisors is an integer number (169992648).

Almost surely, 2^678620941 is an apocalyptic number.

It is an amenable number.

678620941 is a deficient number, since it is larger than the sum of its proper divisors (1349651).

678620941 is a wasteful number, since it uses less digits than its factorization.

678620941 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1349650.

The product of its (nonzero) digits is 145152, while the sum is 43.

The square root of 678620941 is about 26050.3539515301. The cubic root of 678620941 is about 878.7710725562.

The spelling of 678620941 in words is "six hundred seventy-eight million, six hundred twenty thousand, nine hundred forty-one".