208428771 has 16 divisors (see below), whose sum is σ = 288381600. Its totient is φ = 133744128.

The previous prime is 208428763. The next prime is 208428811. The reversal of 208428771 is 177824802.

It is not a de Polignac number, because 208428771 - 2³ = 208428763 is a prime.

It is not an unprimeable number, because it can be changed into a prime (208428761) 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, 25765 + ... + 32873.

It is an arithmetic number, because the mean of its divisors is an integer number (18023850).

Almost surely, 2^208428771 is an apocalyptic number.

208428771 is a deficient number, since it is larger than the sum of its proper divisors (79952829).

208428771 is a wasteful number, since it uses less digits than its factorization.

208428771 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7478.

The product of its (nonzero) digits is 50176, while the sum is 39.

The square root of 208428771 is about 14437.0624089529. The cubic root of 208428771 is about 592.9060600216.

The spelling of 208428771 in words is "two hundred eight million, four hundred twenty-eight thousand, seven hundred seventy-one".