678133697 has 4 divisors (see below), whose sum is σ = 683083716. Its totient is φ = 673183680.

The previous prime is 678133591. The next prime is 678133699. The reversal of 678133697 is 796331876.

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

It can be written as a sum of positive squares in 2 ways, for example, as 398441521 + 279692176 = 19961^2 + 16724^2 .

It is a cyclic number.

It is not a de Polignac number, because 678133697 - 2⁸ = 678133441 is a prime.

It is a super-2 number, since 2×678133697² = 919730622013775618, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (678133699) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2474804 + ... + 2475077.

It is an arithmetic number, because the mean of its divisors is an integer number (170770929).

Almost surely, 2^678133697 is an apocalyptic number.

It is an amenable number.

678133697 is a deficient number, since it is larger than the sum of its proper divisors (4950019).

678133697 is a wasteful number, since it uses less digits than its factorization.

678133697 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4950018.

The product of its digits is 1143072, while the sum is 50.

The square root of 678133697 is about 26041.0003072079. Note that the first 3 decimals coincide. The cubic root of 678133697 is about 878.5607055098.

The spelling of 678133697 in words is "six hundred seventy-eight million, one hundred thirty-three thousand, six hundred ninety-seven".