678778071 has 4 divisors (see below), whose sum is σ = 905037432. Its totient is φ = 452518712.

The previous prime is 678778063. The next prime is 678778073. The reversal of 678778071 is 170877876.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 678778071 - 2³ = 678778063 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (678778073) 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, 113129676 + ... + 113129681.

It is an arithmetic number, because the mean of its divisors is an integer number (226259358).

Almost surely, 2^678778071 is an apocalyptic number.

678778071 is a deficient number, since it is larger than the sum of its proper divisors (226259361).

678778071 is a wasteful number, since it uses less digits than its factorization.

678778071 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 226259360.

The product of its (nonzero) digits is 921984, while the sum is 51.

The square root of 678778071 is about 26053.3696668972. The cubic root of 678778071 is about 878.8388917831.

The spelling of 678778071 in words is "six hundred seventy-eight million, seven hundred seventy-eight thousand, seventy-one".