208128963 has 16 divisors (see below), whose sum is σ = 317382656. Its totient is φ = 118843200.

The previous prime is 208128953. The next prime is 208128971. The reversal of 208128963 is 369821802.

It is a happy number.

It is not a de Polignac number, because 208128963 - 2⁸ = 208128707 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (208128953) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 35070 + ... + 40572.

It is an arithmetic number, because the mean of its divisors is an integer number (19836416).

Almost surely, 2^208128963 is an apocalyptic number.

208128963 is a deficient number, since it is larger than the sum of its proper divisors (109253693).

208128963 is a wasteful number, since it uses less digits than its factorization.

208128963 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7314.

The product of its (nonzero) digits is 41472, while the sum is 39.

The square root of 208128963 is about 14426.6753966394. The cubic root of 208128963 is about 592.6216410688.

The spelling of 208128963 in words is "two hundred eight million, one hundred twenty-eight thousand, nine hundred sixty-three".