687746133 has 24 divisors (see below), whose sum is σ = 1031430400. Its totient is φ = 457951968.

The previous prime is 687746131. The next prime is 687746149. The reversal of 687746133 is 331647786.

It is not a de Polignac number, because 687746133 - 2¹ = 687746131 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (687746131) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 390108 + ... + 391866.

Almost surely, 2^687746133 is an apocalyptic number.

It is an amenable number.

687746133 is a deficient number, since it is larger than the sum of its proper divisors (343684267).

687746133 is a wasteful number, since it uses less digits than its factorization.

687746133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3383 (or 3371 counting only the distinct ones).

The product of its digits is 508032, while the sum is 45.

The square root of 687746133 is about 26224.9143563902. The cubic root of 687746133 is about 882.6923967468.

The spelling of 687746133 in words is "six hundred eighty-seven million, seven hundred forty-six thousand, one hundred thirty-three".