687007645 has 8 divisors (see below), whose sum is σ = 824555520. Its totient is φ = 549508560.

The previous prime is 687007619. The next prime is 687007661. The reversal of 687007645 is 546700786.

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

It is not a de Polignac number, because 687007645 - 2¹⁷ = 686876573 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36376 + ... + 51934.

It is an arithmetic number, because the mean of its divisors is an integer number (103069440).

Almost surely, 2^687007645 is an apocalyptic number.

It is an amenable number.

687007645 is a deficient number, since it is larger than the sum of its proper divisors (137547875).

687007645 is a wasteful number, since it uses less digits than its factorization.

687007645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24395.

The product of its (nonzero) digits is 282240, while the sum is 43.

The square root of 687007645 is about 26210.8306812279. The cubic root of 687007645 is about 882.3763444673.

The spelling of 687007645 in words is "six hundred eighty-seven million, seven thousand, six hundred forty-five".