687492407 has 16 divisors (see below), whose sum is σ = 795916800. Its totient is φ = 581671968.

The previous prime is 687492401. The next prime is 687492419. The reversal of 687492407 is 704294786.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-687492407 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (687492401) 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 15 ways as a sum of consecutive naturals, for example, 172208 + ... + 176154.

It is an arithmetic number, because the mean of its divisors is an integer number (49744800).

Almost surely, 2^687492407 is an apocalyptic number.

687492407 is a deficient number, since it is larger than the sum of its proper divisors (108424393).

687492407 is a wasteful number, since it uses less digits than its factorization.

687492407 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4270.

The product of its (nonzero) digits is 677376, while the sum is 47.

The square root of 687492407 is about 26220.0764110252. The cubic root of 687492407 is about 882.5838346153.

The spelling of 687492407 in words is "six hundred eighty-seven million, four hundred ninety-two thousand, four hundred seven".