687472831 has 4 divisors (see below), whose sum is σ = 688117000. Its totient is φ = 686828664.

The previous prime is 687472813. The next prime is 687472861. The reversal of 687472831 is 138274786.

687472831 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.

It is a cyclic number.

It is not a de Polignac number, because 687472831 - 2⁷ = 687472703 is a prime.

It is a super-2 number, since 2×687472831² = 945237786726309122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (687472861) 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, 320481 + ... + 322618.

It is an arithmetic number, because the mean of its divisors is an integer number (172029250).

Almost surely, 2^687472831 is an apocalyptic number.

687472831 is a deficient number, since it is larger than the sum of its proper divisors (644169).

687472831 is a wasteful number, since it uses less digits than its factorization.

687472831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 644168.

The product of its digits is 451584, while the sum is 46.

The square root of 687472831 is about 26219.7031066334. The cubic root of 687472831 is about 882.5754574924.

The spelling of 687472831 in words is "six hundred eighty-seven million, four hundred seventy-two thousand, eight hundred thirty-one".