678340742 has 4 divisors (see below), whose sum is σ = 1017511116. Its totient is φ = 339170370.

The previous prime is 678340703. The next prime is 678340757. The reversal of 678340742 is 247043876.

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

It is a super-2 number, since 2×678340742² = 920292324514221128, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 678340742.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 169585184 + ... + 169585187.

It is an arithmetic number, because the mean of its divisors is an integer number (254377779).

Almost surely, 2^678340742 is an apocalyptic number.

678340742 is a deficient number, since it is larger than the sum of its proper divisors (339170374).

678340742 is a wasteful number, since it uses less digits than its factorization.

678340742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 339170373.

The product of its (nonzero) digits is 225792, while the sum is 41.

The square root of 678340742 is about 26044.9753695411. The cubic root of 678340742 is about 878.6501092625.

The spelling of 678340742 in words is "six hundred seventy-eight million, three hundred forty thousand, seven hundred forty-two".