687113028 has 72 divisors (see below), whose sum is σ = 2017579200. Its totient is φ = 193095360.

The previous prime is 687113023. The next prime is 687113059. The reversal of 687113028 is 820311786.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 687112983 and 687113001.

It is not an unprimeable number, because it can be changed into a prime (687113023) 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, 6978 + ... + 37721.

Almost surely, 2^687113028 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 687113028, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1008789600).

687113028 is an abundant number, since it is smaller than the sum of its proper divisors (1330466172).

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

687113028 is a wasteful number, since it uses less digits than its factorization.

687113028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44777 (or 44772 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 36.

The square root of 687113028 is about 26212.8408990708. The cubic root of 687113028 is about 882.4214593035.

The spelling of 687113028 in words is "six hundred eighty-seven million, one hundred thirteen thousand, twenty-eight".