687405079 has 2 divisors, whose sum is σ = 687405080. Its totient is φ = 687405078.

The previous prime is 687405049. The next prime is 687405107. The reversal of 687405079 is 970504786.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 687405079 - 2⁹ = 687404567 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (687405029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343702539 + 343702540.

It is an arithmetic number, because the mean of its divisors is an integer number (343702540).

Almost surely, 2^687405079 is an apocalyptic number.

687405079 is a deficient number, since it is larger than the sum of its proper divisors (1).

687405079 is an equidigital number, since it uses as much as digits as its factorization.

687405079 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 423360, while the sum is 46.

The square root of 687405079 is about 26218.4110693230. The cubic root of 687405079 is about 882.5464632718.

The spelling of 687405079 in words is "six hundred eighty-seven million, four hundred five thousand, seventy-nine".