687655028 has 6 divisors (see below), whose sum is σ = 1203396306. Its totient is φ = 343827512.

The previous prime is 687655021. The next prime is 687655037. The reversal of 687655028 is 820556786.

687655028 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 460188304 + 227466724 = 21452^2 + 15082^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (687655021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85956875 + ... + 85956882.

It is an arithmetic number, because the mean of its divisors is an integer number (200566051).

Almost surely, 2^687655028 is an apocalyptic number.

It is an amenable number.

687655028 is a deficient number, since it is larger than the sum of its proper divisors (515741278).

687655028 is a wasteful number, since it uses less digits than its factorization.

687655028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171913761 (or 171913759 counting only the distinct ones).

The product of its (nonzero) digits is 806400, while the sum is 47.

The square root of 687655028 is about 26223.1773055822. The cubic root of 687655028 is about 882.6534185841.

The spelling of 687655028 in words is "six hundred eighty-seven million, six hundred fifty-five thousand, twenty-eight".