687240419 has 4 divisors (see below), whose sum is σ = 727666344. Its totient is φ = 646814496.

The previous prime is 687240413. The next prime is 687240427. The reversal of 687240419 is 914042786.

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

It is a cyclic number.

It is not a de Polignac number, because 687240419 - 2²⁸ = 418804963 is a prime.

It is a super-2 number, since 2×687240419² = 944598787014591122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (687240413) 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 3 ways as a sum of consecutive naturals, for example, 20212937 + ... + 20212970.

It is an arithmetic number, because the mean of its divisors is an integer number (181916586).

Almost surely, 2^687240419 is an apocalyptic number.

687240419 is a deficient number, since it is larger than the sum of its proper divisors (40425925).

687240419 is a wasteful number, since it uses less digits than its factorization.

687240419 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40425924.

The product of its (nonzero) digits is 96768, while the sum is 41.

The square root of 687240419 is about 26215.2707214707. The cubic root of 687240419 is about 882.4759896845.

The spelling of 687240419 in words is "six hundred eighty-seven million, two hundred forty thousand, four hundred nineteen".