678352091 has 4 divisors (see below), whose sum is σ = 678404184. Its totient is φ = 678300000.

The previous prime is 678352061. The next prime is 678352097. The reversal of 678352091 is 190253876.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 678352091 - 2¹⁰ = 678351067 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (678352097) 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, 12716 + ... + 38966.

It is an arithmetic number, because the mean of its divisors is an integer number (169601046).

Almost surely, 2^678352091 is an apocalyptic number.

678352091 is a deficient number, since it is larger than the sum of its proper divisors (52093).

678352091 is a wasteful number, since it uses less digits than its factorization.

678352091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52092.

The product of its (nonzero) digits is 90720, while the sum is 41.

The square root of 678352091 is about 26045.1932417481. The cubic root of 678352091 is about 878.6550093291.

The spelling of 678352091 in words is "six hundred seventy-eight million, three hundred fifty-two thousand, ninety-one".