678613026 has 64 divisors (see below), whose sum is σ = 1681698816. Its totient is φ = 177768000.

The previous prime is 678612989. The next prime is 678613027. The reversal of 678613026 is 620316876.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (678613027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 78331 + ... + 86561.

It is an arithmetic number, because the mean of its divisors is an integer number (26276544).

Almost surely, 2^678613026 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 678613026, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (840849408).

678613026 is an abundant number, since it is smaller than the sum of its proper divisors (1003085790).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

678613026 is a wasteful number, since it uses less digits than its factorization.

678613026 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8407.

The product of its (nonzero) digits is 72576, while the sum is 39.

The square root of 678613026 is about 26050.2020337655. The cubic root of 678613026 is about 878.7676560686.

The spelling of 678613026 in words is "six hundred seventy-eight million, six hundred thirteen thousand, twenty-six".