687493643 has 2 divisors, whose sum is σ = 687493644. Its totient is φ = 687493642.

The previous prime is 687493637. The next prime is 687493649. The reversal of 687493643 is 346394786.

It is a balanced prime because it is at equal distance from previous prime (687493637) and next prime (687493649).

It is a cyclic number.

It is not a de Polignac number, because 687493643 - 2⁴ = 687493627 is a prime.

It is a super-2 number, since 2×687493643² = 945295018330822898, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 687493591 and 687493600.

It is not a weakly prime, because it can be changed into another prime (687493649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343746821 + 343746822.

It is an arithmetic number, because the mean of its divisors is an integer number (343746822).

Almost surely, 2^687493643 is an apocalyptic number.

687493643 is a deficient number, since it is larger than the sum of its proper divisors (1).

687493643 is an equidigital number, since it uses as much as digits as its factorization.

687493643 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2612736, while the sum is 50.

The square root of 687493643 is about 26220.0999807400. The cubic root of 687493643 is about 882.5843635293.

The spelling of 687493643 in words is "six hundred eighty-seven million, four hundred ninety-three thousand, six hundred forty-three".