687469 has 4 divisors (see below), whose sum is σ = 702144. Its totient is φ = 672796.

The previous prime is 687461. The next prime is 687473. The reversal of 687469 is 964786.

687469 = T₁₄₇ + T₁₄₈ + ... + T₁₉₃.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 964786 = 2 ⋅482393.

It is a cyclic number.

It is not a de Polignac number, because 687469 - 2³ = 687461 is a prime.

It is a super-2 number, since 2×687469² = 945227251922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (687461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7267 + ... + 7360.

It is an arithmetic number, because the mean of its divisors is an integer number (175536).

2⁶⁸⁷⁴⁶⁹ is an apocalyptic number.

It is an amenable number.

687469 is a deficient number, since it is larger than the sum of its proper divisors (14675).

687469 is a wasteful number, since it uses less digits than its factorization.

687469 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14674.

The product of its digits is 72576, while the sum is 40.

The square root of 687469 is about 829.1375036748. The cubic root of 687469 is about 88.2573818081.

It can be divided in two parts, 687 and 469, that added together give a square (1156 = 34²).

The spelling of 687469 in words is "six hundred eighty-seven thousand, four hundred sixty-nine".