208278213 has 16 divisors (see below), whose sum is σ = 326254656. Its totient is φ = 116519040.

The previous prime is 208278163. The next prime is 208278221. The reversal of 208278213 is 312872802.

It is not a de Polignac number, because 208278213 - 2⁸ = 208277957 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (208278253) 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, 242320 + ... + 243177.

It is an arithmetic number, because the mean of its divisors is an integer number (20390916).

Almost surely, 2^208278213 is an apocalyptic number.

It is an amenable number.

208278213 is a deficient number, since it is larger than the sum of its proper divisors (117976443).

208278213 is a wasteful number, since it uses less digits than its factorization.

208278213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 485524.

The product of its (nonzero) digits is 10752, while the sum is 33.

The square root of 208278213 is about 14431.8471790689. The cubic root of 208278213 is about 592.7632642316.

The spelling of 208278213 in words is "two hundred eight million, two hundred seventy-eight thousand, two hundred thirteen".