678049251 has 8 divisors (see below), whose sum is σ = 986253504. Its totient is φ = 410938920.

The previous prime is 678049249. The next prime is 678049279. The reversal of 678049251 is 152940876.

678049251 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 678049251 - 2¹ = 678049249 is a prime.

It is a super-2 number, since 2×678049251² = 919501573563322002, which contains 22 as substring.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (678049231) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10273441 + ... + 10273506.

It is an arithmetic number, because the mean of its divisors is an integer number (123281688).

Almost surely, 2^678049251 is an apocalyptic number.

678049251 is a deficient number, since it is larger than the sum of its proper divisors (308204253).

678049251 is a wasteful number, since it uses less digits than its factorization.

678049251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20546961.

The product of its (nonzero) digits is 120960, while the sum is 42.

The square root of 678049251 is about 26039.3788520387. The cubic root of 678049251 is about 878.5242358001.

The spelling of 678049251 in words is "six hundred seventy-eight million, forty-nine thousand, two hundred fifty-one".