687073055 has 4 divisors (see below), whose sum is σ = 824487672. Its totient is φ = 549658440.

The previous prime is 687073021. The next prime is 687073067. The reversal of 687073055 is 550370786.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 687073055 - 2¹² = 687068959 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 68707301 + ... + 68707310.

It is an arithmetic number, because the mean of its divisors is an integer number (206121918).

Almost surely, 2^687073055 is an apocalyptic number.

687073055 is a deficient number, since it is larger than the sum of its proper divisors (137414617).

687073055 is a wasteful number, since it uses less digits than its factorization.

687073055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137414616.

The product of its (nonzero) digits is 176400, while the sum is 41.

The square root of 687073055 is about 26212.0784181644. The cubic root of 687073055 is about 882.4043472634.

The spelling of 687073055 in words is "six hundred eighty-seven million, seventy-three thousand, fifty-five".