687253345 has 4 divisors (see below), whose sum is σ = 824704020. Its totient is φ = 549802672.

The previous prime is 687253337. The next prime is 687253349. The reversal of 687253345 is 543352786.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 543352786 = 2 ⋅271676393.

It can be written as a sum of positive squares in 2 ways, for example, as 267126336 + 420127009 = 16344^2 + 20497^2 .

It is a cyclic number.

It is not a de Polignac number, because 687253345 - 2³ = 687253337 is a prime.

It is not an unprimeable number, because it can be changed into a prime (687253349) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 68725330 + ... + 68725339.

It is an arithmetic number, because the mean of its divisors is an integer number (206176005).

Almost surely, 2^687253345 is an apocalyptic number.

It is an amenable number.

687253345 is a deficient number, since it is larger than the sum of its proper divisors (137450675).

687253345 is a wasteful number, since it uses less digits than its factorization.

687253345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137450674.

The product of its digits is 604800, while the sum is 43.

The square root of 687253345 is about 26215.5172560070. The cubic root of 687253345 is about 882.4815223496.

The spelling of 687253345 in words is "six hundred eighty-seven million, two hundred fifty-three thousand, three hundred forty-five".