687348733 has 4 divisors (see below), whose sum is σ = 694154268. Its totient is φ = 680543200.

The previous prime is 687348707. The next prime is 687348737. The reversal of 687348733 is 337843786.

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 437771929 + 249576804 = 20923^2 + 15798^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-687348733 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (687348737) 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, 3402616 + ... + 3402817.

It is an arithmetic number, because the mean of its divisors is an integer number (173538567).

Almost surely, 2^687348733 is an apocalyptic number.

It is an amenable number.

687348733 is a deficient number, since it is larger than the sum of its proper divisors (6805535).

687348733 is a wasteful number, since it uses less digits than its factorization.

687348733 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6805534.

The product of its digits is 2032128, while the sum is 49.

The square root of 687348733 is about 26217.3364970586. The cubic root of 687348733 is about 882.5223487560.

The spelling of 687348733 in words is "six hundred eighty-seven million, three hundred forty-eight thousand, seven hundred thirty-three".