678911997 has 16 divisors (see below), whose sum is σ = 950261760. Its totient is φ = 430580400.

The previous prime is 678911977. The next prime is 678912007. The reversal of 678911997 is 799119876.

It is not a de Polignac number, because 678911997 - 2⁸ = 678911741 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (678911977) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 56379 + ... + 67352.

It is an arithmetic number, because the mean of its divisors is an integer number (59391360).

Almost surely, 2^678911997 is an apocalyptic number.

It is an amenable number.

678911997 is a deficient number, since it is larger than the sum of its proper divisors (271349763).

678911997 is a wasteful number, since it uses less digits than its factorization.

678911997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123824.

The product of its digits is 1714608, while the sum is 57.

The square root of 678911997 is about 26055.9397642841. The cubic root of 678911997 is about 878.8966876187.

The spelling of 678911997 in words is "six hundred seventy-eight million, nine hundred eleven thousand, nine hundred ninety-seven".