687467245 has 4 divisors (see below), whose sum is σ = 824960700. Its totient is φ = 549973792.

The previous prime is 687467203. The next prime is 687467269. The reversal of 687467245 is 542764786.

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

It can be written as a sum of positive squares in 2 ways, for example, as 161315401 + 526151844 = 12701^2 + 22938^2 .

It is a cyclic number.

It is not a de Polignac number, because 687467245 - 2²³ = 679078637 is a prime.

It is a super-2 number, since 2×687467245² = 945222425895780050, which contains 22 as substring.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax 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, 68746720 + ... + 68746729.

It is an arithmetic number, because the mean of its divisors is an integer number (206240175).

Almost surely, 2^687467245 is an apocalyptic number.

It is an amenable number.

687467245 is a deficient number, since it is larger than the sum of its proper divisors (137493455).

687467245 is a wasteful number, since it uses less digits than its factorization.

687467245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137493454.

The product of its digits is 2257920, while the sum is 49.

The square root of 687467245 is about 26219.5965834717. The cubic root of 687467245 is about 882.5730670562.

The spelling of 687467245 in words is "six hundred eighty-seven million, four hundred sixty-seven thousand, two hundred forty-five".