678566500 has 72 divisors (see below), whose sum is σ = 1507674168. Its totient is φ = 266795200.

The previous prime is 678566467. The next prime is 678566503. The reversal of 678566500 is 5665876.

It can be written as a sum of positive squares in 4 ways, for example, as 7963684 + 670602816 = 2822^2 + 25896^2 .

It is a nialpdrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (678566503) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3444402 + ... + 3444598.

It is an arithmetic number, because the mean of its divisors is an integer number (20939919).

Almost surely, 2^678566500 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 678566500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (753837084).

678566500 is an abundant number, since it is smaller than the sum of its proper divisors (829107668).

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

678566500 is a wasteful number, since it uses less digits than its factorization.

678566500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 382 (or 287 counting only the distinct ones).

The product of its (nonzero) digits is 302400, while the sum is 43.

The square root of 678566500 is about 26049.3090119489. The cubic root of 678566500 is about 878.7475727139.

The spelling of 678566500 in words is "six hundred seventy-eight million, five hundred sixty-six thousand, five hundred".