678856522 has 4 divisors (see below), whose sum is σ = 1018284786. Its totient is φ = 339428260.

The previous prime is 678856517. The next prime is 678856543. The reversal of 678856522 is 225658876.

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., 666104481 + 12752041 = 25809^2 + 3571^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 169714129 + ... + 169714132.

Almost surely, 2^678856522 is an apocalyptic number.

678856522 is a deficient number, since it is larger than the sum of its proper divisors (339428264).

678856522 is a wasteful number, since it uses less digits than its factorization.

678856522 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 339428263.

The product of its digits is 1612800, while the sum is 49.

The square root of 678856522 is about 26054.8752059955. The cubic root of 678856522 is about 878.8727482756.

The spelling of 678856522 in words is "six hundred seventy-eight million, eight hundred fifty-six thousand, five hundred twenty-two".