678545122 has 4 divisors (see below), whose sum is σ = 1017817686. Its totient is φ = 339272560.

The previous prime is 678545099. The next prime is 678545137. The reversal of 678545122 is 221545876.

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

It can be written as a sum of positive squares in only one way, i.e., 473454081 + 205091041 = 21759^2 + 14321^2 .

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 169636279 + ... + 169636282.

Almost surely, 2^678545122 is an apocalyptic number.

678545122 is a deficient number, since it is larger than the sum of its proper divisors (339272564).

678545122 is a wasteful number, since it uses less digits than its factorization.

678545122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 339272563.

The product of its digits is 134400, while the sum is 40.

The square root of 678545122 is about 26048.8986715370. The cubic root of 678545122 is about 878.7383444054.

The spelling of 678545122 in words is "six hundred seventy-eight million, five hundred forty-five thousand, one hundred twenty-two".