678838957 has 8 divisors (see below), whose sum is σ = 682241472. Its totient is φ = 675444000.

The previous prime is 678838933. The next prime is 678838969. The reversal of 678838957 is 759838876.

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

It is a cyclic number.

It is not a de Polignac number, because 678838957 - 2⁷ = 678838829 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 678838895 and 678838904.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (678835957) 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, 264832 + ... + 267382.

It is an arithmetic number, because the mean of its divisors is an integer number (85280184).

Almost surely, 2^678838957 is an apocalyptic number.

It is an amenable number.

678838957 is a deficient number, since it is larger than the sum of its proper divisors (3402515).

678838957 is a wasteful number, since it uses less digits than its factorization.

678838957 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3779.

The product of its digits is 20321280, while the sum is 61.

The square root of 678838957 is about 26054.5381267832. The cubic root of 678838957 is about 878.8651681107.

The spelling of 678838957 in words is "six hundred seventy-eight million, eight hundred thirty-eight thousand, nine hundred fifty-seven".