678913565 has 8 divisors (see below), whose sum is σ = 888759648. Its totient is φ = 493755280.

The previous prime is 678913561. The next prime is 678913579. The reversal of 678913565 is 565319876.

It is a happy number.

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

It is not a de Polignac number, because 678913565 - 2² = 678913561 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 (678913561) 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, 6171887 + ... + 6171996.

It is an arithmetic number, because the mean of its divisors is an integer number (111094956).

Almost surely, 2^678913565 is an apocalyptic number.

It is an amenable number.

678913565 is a deficient number, since it is larger than the sum of its proper divisors (209846083).

678913565 is a wasteful number, since it uses less digits than its factorization.

678913565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12343899.

The product of its digits is 1360800, while the sum is 50.

The square root of 678913565 is about 26055.9698533753. The cubic root of 678913565 is about 878.8973642449.

The spelling of 678913565 in words is "six hundred seventy-eight million, nine hundred thirteen thousand, five hundred sixty-five".