208971764 has 12 divisors (see below), whose sum is σ = 366739044. Its totient is φ = 104189184.

The previous prime is 208971757. The next prime is 208971773. The reversal of 208971764 is 467179802.

It can be written as a sum of positive squares in 2 ways, for example, as 139948900 + 69022864 = 11830^2 + 8308^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 72587 + ... + 75410.

It is an arithmetic number, because the mean of its divisors is an integer number (30561587).

Almost surely, 2^208971764 is an apocalyptic number.

It is an amenable number.

208971764 is a deficient number, since it is larger than the sum of its proper divisors (157767280).

208971764 is a wasteful number, since it uses less digits than its factorization.

208971764 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148354 (or 148352 counting only the distinct ones).

The product of its (nonzero) digits is 169344, while the sum is 44.

The square root of 208971764 is about 14455.8556993351. The cubic root of 208971764 is about 593.4204878355.

The spelling of 208971764 in words is "two hundred eight million, nine hundred seventy-one thousand, seven hundred sixty-four".