687328533 has 24 divisors (see below), whose sum is σ = 1007356896. Its totient is φ = 451548000.

The previous prime is 687328487. The next prime is 687328597. The reversal of 687328533 is 335823786.

687328533 is a `hidden beast` number, since 6 + 87 + 32 + 8 + 533 = 666.

It is not a de Polignac number, because 687328533 - 2¹² = 687324437 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (687320533) 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 23 ways as a sum of consecutive naturals, for example, 204678 + ... + 208008.

It is an arithmetic number, because the mean of its divisors is an integer number (41973204).

Almost surely, 2^687328533 is an apocalyptic number.

It is an amenable number.

687328533 is a deficient number, since it is larger than the sum of its proper divisors (320028363).

687328533 is a wasteful number, since it uses less digits than its factorization.

687328533 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3665 (or 3662 counting only the distinct ones).

The product of its digits is 725760, while the sum is 45.

The square root of 687328533 is about 26216.9512529585. The cubic root of 687328533 is about 882.5137033988.

The spelling of 687328533 in words is "six hundred eighty-seven million, three hundred twenty-eight thousand, five hundred thirty-three".