687487653 has 6 divisors (see below), whose sum is σ = 993037734. Its totient is φ = 458325096.

The previous prime is 687487561. The next prime is 687487663. The reversal of 687487653 is 356784786.

It can be written as a sum of positive squares in only one way, i.e., 649332324 + 38155329 = 25482^2 + 6177^2 .

It is not a de Polignac number, because 687487653 - 2¹³ = 687479461 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 687487653.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (687487663) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 38193750 + ... + 38193767.

It is an arithmetic number, because the mean of its divisors is an integer number (165506289).

Almost surely, 2^687487653 is an apocalyptic number.

It is an amenable number.

687487653 is a deficient number, since it is larger than the sum of its proper divisors (305550081).

687487653 is a wasteful number, since it uses less digits than its factorization.

687487653 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76387523 (or 76387520 counting only the distinct ones).

The product of its digits is 6773760, while the sum is 54.

The square root of 687487653 is about 26219.9857551449. The cubic root of 687487653 is about 882.5818002592.

The spelling of 687487653 in words is "six hundred eighty-seven million, four hundred eighty-seven thousand, six hundred fifty-three".