678794947 has 4 divisors (see below), whose sum is σ = 694580920. Its totient is φ = 663008976.

The previous prime is 678794927. The next prime is 678794957. The reversal of 678794947 is 749497876.

678794947 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 678794947 - 2¹¹ = 678792899 is a prime.

It is a super-3 number, since 3×678794947³ (a number of 27 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (678794927) 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, 7892922 + ... + 7893007.

It is an arithmetic number, because the mean of its divisors is an integer number (173645230).

Almost surely, 2^678794947 is an apocalyptic number.

678794947 is a deficient number, since it is larger than the sum of its proper divisors (15785973).

678794947 is a wasteful number, since it uses less digits than its factorization.

678794947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15785972.

The product of its digits is 21337344, while the sum is 61.

The square root of 678794947 is about 26053.6935385369. The cubic root of 678794947 is about 878.8461750484.

The spelling of 678794947 in words is "six hundred seventy-eight million, seven hundred ninety-four thousand, nine hundred forty-seven".