687086028 has 36 divisors (see below), whose sum is σ = 1761269328. Its totient is φ = 225802080.

The previous prime is 687086021. The next prime is 687086033. The reversal of 687086028 is 820680786.

It is a tau number, because it is divible by the number of its divisors (36).

It is not an unprimeable number, because it can be changed into a prime (687086021) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 131851 + ... + 136962.

It is an arithmetic number, because the mean of its divisors is an integer number (48924148).

Almost surely, 2^687086028 is an apocalyptic number.

It is an amenable number.

687086028 is an abundant number, since it is smaller than the sum of its proper divisors (1074183300).

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

687086028 is a wasteful number, since it uses less digits than its factorization.

687086028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 268894 (or 268889 counting only the distinct ones).

The product of its (nonzero) digits is 258048, while the sum is 45.

The square root of 687086028 is about 26212.3258792500. The cubic root of 687086028 is about 882.4099009472.

The spelling of 687086028 in words is "six hundred eighty-seven million, eighty-six thousand, twenty-eight".