687856753 has 4 divisors (see below), whose sum is σ = 724059760. Its totient is φ = 651653748.

The previous prime is 687856747. The next prime is 687856759. The reversal of 687856753 is 357658786.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (687856747) and next prime (687856759).

It is a cyclic number.

It is not a de Polignac number, because 687856753 - 2¹³ = 687848561 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 687856694 and 687856703.

It is not an unprimeable number, because it can be changed into a prime (687856759) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18101475 + ... + 18101512.

It is an arithmetic number, because the mean of its divisors is an integer number (181014940).

Almost surely, 2^687856753 is an apocalyptic number.

It is an amenable number.

687856753 is a deficient number, since it is larger than the sum of its proper divisors (36203007).

687856753 is a wasteful number, since it uses less digits than its factorization.

687856753 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36203006.

The product of its digits is 8467200, while the sum is 55.

The square root of 687856753 is about 26227.0233347210. The cubic root of 687856753 is about 882.7397195372.

The spelling of 687856753 in words is "six hundred eighty-seven million, eight hundred fifty-six thousand, seven hundred fifty-three".