208029990 has 96 divisors (see below), whose sum is σ = 593339904. Its totient is φ = 46522560.

The previous prime is 208029977. The next prime is 208030007. The reversal of 208029990 is 99920802.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 67585 + ... + 70595.

It is an arithmetic number, because the mean of its divisors is an integer number (6180624).

Almost surely, 2^208029990 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 208029990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (296669952).

208029990 is an abundant number, since it is smaller than the sum of its proper divisors (385309914).

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

208029990 is a wasteful number, since it uses less digits than its factorization.

208029990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3082 (or 3075 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 39.

The square root of 208029990 is about 14423.2447805617. The cubic root of 208029990 is about 592.5276883569.

The spelling of 208029990 in words is "two hundred eight million, twenty-nine thousand, nine hundred ninety".