678740865 has 32 divisors (see below), whose sum is σ = 1209931776. Its totient is φ = 322080960.

The previous prime is 678740849. The next prime is 678740899. The reversal of 678740865 is 568047876.

It is not a de Polignac number, because 678740865 - 2⁴ = 678740849 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 36007 + ... + 51516.

It is an arithmetic number, because the mean of its divisors is an integer number (37810368).

Almost surely, 2^678740865 is an apocalyptic number.

It is an amenable number.

678740865 is a deficient number, since it is larger than the sum of its proper divisors (531190911).

678740865 is a wasteful number, since it uses less digits than its factorization.

678740865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87589.

The product of its (nonzero) digits is 2257920, while the sum is 51.

The square root of 678740865 is about 26052.6556227959. The cubic root of 678740865 is about 878.8228341649.

The spelling of 678740865 in words is "six hundred seventy-eight million, seven hundred forty thousand, eight hundred sixty-five".