687240417 has 8 divisors (see below), whose sum is σ = 917803360. Its totient is φ = 457418880.

The previous prime is 687240413. The next prime is 687240427. The reversal of 687240417 is 714042786.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 687240417 - 2² = 687240413 is a prime.

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 polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 183184 + ... + 186897.

It is an arithmetic number, because the mean of its divisors is an integer number (114725420).

Almost surely, 2^687240417 is an apocalyptic number.

It is an amenable number.

687240417 is a deficient number, since it is larger than the sum of its proper divisors (230562943).

687240417 is a wasteful number, since it uses less digits than its factorization.

687240417 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 370703.

The product of its (nonzero) digits is 75264, while the sum is 39.

The square root of 687240417 is about 26215.2706833250. The cubic root of 687240417 is about 882.4759888285.

The spelling of 687240417 in words is "six hundred eighty-seven million, two hundred forty thousand, four hundred seventeen".