678157 has 2 divisors, whose sum is σ = 678158. Its totient is φ = 678156.

The previous prime is 678133. The next prime is 678169. The reversal of 678157 is 751876.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 670761 + 7396 = 819^2 + 86^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-678157 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (678757) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 339078 + 339079.

It is an arithmetic number, because the mean of its divisors is an integer number (339079).

2⁶⁷⁸¹⁵⁷ is an apocalyptic number.

It is an amenable number.

678157 is a deficient number, since it is larger than the sum of its proper divisors (1).

678157 is an equidigital number, since it uses as much as digits as its factorization.

678157 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11760, while the sum is 34.

The square root of 678157 is about 823.5028840265. The cubic root of 678157 is about 87.8570768848.

The spelling of 678157 in words is "six hundred seventy-eight thousand, one hundred fifty-seven".