678092249 has 4 divisors (see below), whose sum is σ = 678318564. Its totient is φ = 677865936.

The previous prime is 678092237. The next prime is 678092257. The reversal of 678092249 is 942290876.

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 532455625 + 145636624 = 23075^2 + 12068^2 .

It is a cyclic number.

It is not a de Polignac number, because 678092249 - 2¹² = 678088153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (678092299) 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, 108602 + ... + 114675.

It is an arithmetic number, because the mean of its divisors is an integer number (169579641).

Almost surely, 2^678092249 is an apocalyptic number.

It is an amenable number.

678092249 is a deficient number, since it is larger than the sum of its proper divisors (226315).

678092249 is a wasteful number, since it uses less digits than its factorization.

678092249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 226314.

The product of its (nonzero) digits is 435456, while the sum is 47.

The square root of 678092249 is about 26040.2044730835. The cubic root of 678092249 is about 878.5428057327.

The spelling of 678092249 in words is "six hundred seventy-eight million, ninety-two thousand, two hundred forty-nine".