687422885 has 4 divisors (see below), whose sum is σ = 824907468. Its totient is φ = 549938304.

The previous prime is 687422843. The next prime is 687422909. The reversal of 687422885 is 588224786.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 79405921 + 608016964 = 8911^2 + 24658^2 .

It is a cyclic number.

It is not a de Polignac number, because 687422885 - 2⁶ = 687422821 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 68742284 + ... + 68742293.

It is an arithmetic number, because the mean of its divisors is an integer number (206226867).

Almost surely, 2^687422885 is an apocalyptic number.

It is an amenable number.

687422885 is a deficient number, since it is larger than the sum of its proper divisors (137484583).

687422885 is a wasteful number, since it uses less digits than its factorization.

687422885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137484582.

The product of its digits is 1720320, while the sum is 50.

The square root of 687422885 is about 26218.7506376639. The cubic root of 687422885 is about 882.5540834689.

The spelling of 687422885 in words is "six hundred eighty-seven million, four hundred twenty-two thousand, eight hundred eighty-five".