687902641 has 2 divisors, whose sum is σ = 687902642. Its totient is φ = 687902640.

The previous prime is 687902629. The next prime is 687902647. The reversal of 687902641 is 146209786.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 348606241 + 339296400 = 18671^2 + 18420^2 .

It is a cyclic number.

It is not a de Polignac number, because 687902641 - 2⁹ = 687902129 is a prime.

It is not a weakly prime, because it can be changed into another prime (687902647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343951320 + 343951321.

It is an arithmetic number, because the mean of its divisors is an integer number (343951321).

Almost surely, 2^687902641 is an apocalyptic number.

It is an amenable number.

687902641 is a deficient number, since it is larger than the sum of its proper divisors (1).

687902641 is an equidigital number, since it uses as much as digits as its factorization.

687902641 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 145152, while the sum is 43.

The square root of 687902641 is about 26227.8981430080. The cubic root of 687902641 is about 882.7593487499.

The spelling of 687902641 in words is "six hundred eighty-seven million, nine hundred two thousand, six hundred forty-one".