687674741 has 4 divisors (see below), whose sum is σ = 740572812. Its totient is φ = 634776672.

The previous prime is 687674737. The next prime is 687674747. The reversal of 687674741 is 147476786.

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 263932516 + 423742225 = 16246^2 + 20585^2 .

It is a cyclic number.

It is not a de Polignac number, because 687674741 - 2² = 687674737 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 687674741.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (687674747) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26449016 + ... + 26449041.

It is an arithmetic number, because the mean of its divisors is an integer number (185143203).

Almost surely, 2^687674741 is an apocalyptic number.

It is an amenable number.

687674741 is a deficient number, since it is larger than the sum of its proper divisors (52898071).

687674741 is a wasteful number, since it uses less digits than its factorization.

687674741 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52898070.

The product of its digits is 1580544, while the sum is 50.

The square root of 687674741 is about 26223.5531726728. The cubic root of 687674741 is about 882.6618528425.

The spelling of 687674741 in words is "six hundred eighty-seven million, six hundred seventy-four thousand, seven hundred forty-one".