208091730 has 192 divisors, whose sum is σ = 671939712. Its totient is φ = 40642560.

The previous prime is 208091717. The next prime is 208091731. The reversal of 208091730 is 37190802.

It is a happy number.

208091730 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (208091731) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 274512 + ... + 275268.

It is an arithmetic number, because the mean of its divisors is an integer number (3499686).

Almost surely, 2^208091730 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 208091730, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (335969856).

208091730 is an abundant number, since it is smaller than the sum of its proper divisors (463847982).

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

208091730 is a wasteful number, since it uses less digits than its factorization.

208091730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 809 (or 802 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 30.

The square root of 208091730 is about 14425.3849168748. The cubic root of 208091730 is about 592.5863001642.

The spelling of 208091730 in words is "two hundred eight million, ninety-one thousand, seven hundred thirty".