678978103 has 4 divisors (see below), whose sum is σ = 679148640. Its totient is φ = 678807568.

The previous prime is 678978059. The next prime is 678978107. The reversal of 678978103 is 301879876.

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

It is a cyclic number.

It is not a de Polignac number, because 678978103 - 2⁹ = 678977591 is a prime.

It is a super-2 number, since 2×678978103² = 922022528706957218, which contains 22 as substring.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (678978107) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 79150 + ... + 87307.

It is an arithmetic number, because the mean of its divisors is an integer number (169787160).

Almost surely, 2^678978103 is an apocalyptic number.

678978103 is a deficient number, since it is larger than the sum of its proper divisors (170537).

678978103 is a wasteful number, since it uses less digits than its factorization.

678978103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170536.

The product of its (nonzero) digits is 508032, while the sum is 49.

The square root of 678978103 is about 26057.2082733358. The cubic root of 678978103 is about 878.9252128959.

The spelling of 678978103 in words is "six hundred seventy-eight million, nine hundred seventy-eight thousand, one hundred three".