687104028 has 144 divisors (see below), whose sum is σ = 2011595040. Its totient is φ = 195858432.

The previous prime is 687104027. The next prime is 687104051. The reversal of 687104028 is 820401786.

It is a super-2 number, since 2×687104028² = 944223890587649568, which contains 22 as substring.

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 = 687103983 and 687104001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (687104021) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 532408 + ... + 533696.

It is an arithmetic number, because the mean of its divisors is an integer number (13969410).

Almost surely, 2^687104028 is an apocalyptic number.

687104028 is a gapful number since it is divisible by the number (68) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 687104028, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1005797520).

687104028 is an abundant number, since it is smaller than the sum of its proper divisors (1324491012).

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

687104028 is a wasteful number, since it uses less digits than its factorization.

687104028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1396 (or 1391 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 36.

The square root of 687104028 is about 26212.6692269215. The cubic root of 687104028 is about 882.4176065517.

The spelling of 687104028 in words is "six hundred eighty-seven million, one hundred four thousand, twenty-eight".