208161090 has 96 divisors (see below), whose sum is σ = 594397440. Its totient is φ = 52233984.

The previous prime is 208161089. The next prime is 208161091. The reversal of 208161090 is 90161802.

It is an interprime number because it is at equal distance from previous prime (208161089) and next prime (208161091).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (208161091) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 38791 + ... + 43829.

It is an arithmetic number, because the mean of its divisors is an integer number (6191640).

Almost surely, 2^208161090 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 208161090, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (297198720).

208161090 is an abundant number, since it is smaller than the sum of its proper divisors (386236350).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

208161090 is a wasteful number, since it uses less digits than its factorization.

208161090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5078 (or 5066 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 27.

The square root of 208161090 is about 14427.7888118727. The cubic root of 208161090 is about 592.6521320612.

The spelling of 208161090 in words is "two hundred eight million, one hundred sixty-one thousand, ninety".