687133747 has 4 divisors (see below), whose sum is σ = 687360856. Its totient is φ = 686906640.

The previous prime is 687133723. The next prime is 687133757. The reversal of 687133747 is 747331786.

687133747 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 747331786 = 2 ⋅373665893.

It is a cyclic number.

It is not a de Polignac number, because 687133747 - 2⁷ = 687133619 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 687133697 and 687133706.

It is not an unprimeable number, because it can be changed into a prime (687133757) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 108954 + ... + 115087.

It is an arithmetic number, because the mean of its divisors is an integer number (171840214).

Almost surely, 2^687133747 is an apocalyptic number.

687133747 is a deficient number, since it is larger than the sum of its proper divisors (227109).

687133747 is a wasteful number, since it uses less digits than its factorization.

687133747 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 227108.

The product of its digits is 592704, while the sum is 46.

The square root of 687133747 is about 26213.2361031598. The cubic root of 687133747 is about 882.4303286383.

The spelling of 687133747 in words is "six hundred eighty-seven million, one hundred thirty-three thousand, seven hundred forty-seven".