678648837 has 4 divisors (see below), whose sum is σ = 904865120. Its totient is φ = 452432556.

The previous prime is 678648827. The next prime is 678648937. The reversal of 678648837 is 738846876.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 678648837 - 2¹⁸ = 678386693 is a prime.

It is a super-2 number, since 2×678648837² = 921128487922905138, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (678648827) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 113108137 + ... + 113108142.

It is an arithmetic number, because the mean of its divisors is an integer number (226216280).

Almost surely, 2^678648837 is an apocalyptic number.

It is an amenable number.

678648837 is a deficient number, since it is larger than the sum of its proper divisors (226216283).

678648837 is a wasteful number, since it uses less digits than its factorization.

678648837 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 226216282.

The product of its digits is 10838016, while the sum is 57.

The square root of 678648837 is about 26050.8893706146. The cubic root of 678648837 is about 878.7831135747.

The spelling of 678648837 in words is "six hundred seventy-eight million, six hundred forty-eight thousand, eight hundred thirty-seven".