687331089 has 21 divisors (see below), whose sum is σ = 1031587609. Its totient is φ = 457748820.

The previous prime is 687331087. The next prime is 687331109. The reversal of 687331089 is 980133786.

It is a happy number.

The square root of 687331089 is 26217.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 687331089 - 2¹ = 687331087 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (687331087) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 20 ways as a sum of consecutive naturals, for example, 707374 + ... + 708344.

Almost surely, 2^687331089 is an apocalyptic number.

687331089 is the 26217-th square number.

687331089 is the 13109-th centered octagonal number.

It is an amenable number.

687331089 is a deficient number, since it is larger than the sum of its proper divisors (344256520).

687331089 is an frugal number, since it uses more digits than its factorization.

687331089 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1960 (or 974 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 45.

The cubic root of 687331089 is about 882.5147973454.

It can be divided in two parts, 687 and 331089, that added together give a 4-th power (331776 = 24⁴).

The spelling of 687331089 in words is "six hundred eighty-seven million, three hundred thirty-one thousand, eighty-nine".