687071629 has 2 divisors, whose sum is σ = 687071630. Its totient is φ = 687071628.

The previous prime is 687071599. The next prime is 687071641. The reversal of 687071629 is 926170786.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 435849129 + 251222500 = 20877^2 + 15850^2 .

It is a cyclic number.

It is not a de Polignac number, because 687071629 - 2¹⁵ = 687038861 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (687071659) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343535814 + 343535815.

It is an arithmetic number, because the mean of its divisors is an integer number (343535815).

Almost surely, 2^687071629 is an apocalyptic number.

It is an amenable number.

687071629 is a deficient number, since it is larger than the sum of its proper divisors (1).

687071629 is an equidigital number, since it uses as much as digits as its factorization.

687071629 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 254016, while the sum is 46.

The square root of 687071629 is about 26212.0512169498. The cubic root of 687071629 is about 882.4037367949.

The spelling of 687071629 in words is "six hundred eighty-seven million, seventy-one thousand, six hundred twenty-nine".