687538406 has 8 divisors (see below), whose sum is σ = 1031505960. Its totient is φ = 343703088.

The previous prime is 687538399. The next prime is 687538417. The reversal of 687538406 is 604835786.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18836 + ... + 41591.

It is an arithmetic number, because the mean of its divisors is an integer number (128938245).

Almost surely, 2^687538406 is an apocalyptic number.

687538406 is a deficient number, since it is larger than the sum of its proper divisors (343967554).

687538406 is a wasteful number, since it uses less digits than its factorization.

687538406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66118.

The product of its (nonzero) digits is 967680, while the sum is 47.

The square root of 687538406 is about 26220.9535677099. The cubic root of 687538406 is about 882.6035182598.

The spelling of 687538406 in words is "six hundred eighty-seven million, five hundred thirty-eight thousand, four hundred six".