687878730 has 320 divisors, whose sum is σ = 2371057920. Its totient is φ = 138931200.

The previous prime is 687878707. The next prime is 687878797. The reversal of 687878730 is 37878786.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 2557036 + ... + 2557304.

It is an arithmetic number, because the mean of its divisors is an integer number (7409556).

Almost surely, 2^687878730 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 687878730, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1185528960).

687878730 is an abundant number, since it is smaller than the sum of its proper divisors (1683179190).

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

687878730 is a wasteful number, since it uses less digits than its factorization.

687878730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 347 (or 338 counting only the distinct ones).

The product of its (nonzero) digits is 3161088, while the sum is 54.

The square root of 687878730 is about 26227.4423076289. The cubic root of 687878730 is about 882.7491206051.

The spelling of 687878730 in words is "six hundred eighty-seven million, eight hundred seventy-eight thousand, seven hundred thirty".