208664487 has 12 divisors (see below), whose sum is σ = 314509104. Its totient is φ = 133061280.

The previous prime is 208664471. The next prime is 208664501. The reversal of 208664487 is 784466802.

It is not a de Polignac number, because 208664487 - 2⁴ = 208664471 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (208664087) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 503814 + ... + 504227.

It is an arithmetic number, because the mean of its divisors is an integer number (26209092).

Almost surely, 2^208664487 is an apocalyptic number.

208664487 is a deficient number, since it is larger than the sum of its proper divisors (105844617).

208664487 is a wasteful number, since it uses less digits than its factorization.

208664487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1008070 (or 1008067 counting only the distinct ones).

The product of its (nonzero) digits is 516096, while the sum is 45.

The square root of 208664487 is about 14445.2236742807. The cubic root of 208664487 is about 593.1294853394.

The spelling of 208664487 in words is "two hundred eight million, six hundred sixty-four thousand, four hundred eighty-seven".