208233990 has 96 divisors (see below), whose sum is σ = 570286080. Its totient is φ = 54657504.

The previous prime is 208233989. The next prime is 208233997. The reversal of 208233990 is 99332802.

It is a super-2 number, since 2×208233990² = 86722789182640200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (208233997) 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, 162171 + ... + 163449.

It is an arithmetic number, because the mean of its divisors is an integer number (5940480).

Almost surely, 2^208233990 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 208233990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (285143040).

208233990 is an abundant number, since it is smaller than the sum of its proper divisors (362052090).

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

208233990 is a wasteful number, since it uses less digits than its factorization.

208233990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1368 (or 1356 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 36.

The square root of 208233990 is about 14430.3149653776. The cubic root of 208233990 is about 592.7213081304.

The spelling of 208233990 in words is "two hundred eight million, two hundred thirty-three thousand, nine hundred ninety".