208215040 has 88 divisors (see below), whose sum is σ = 545026032. Its totient is φ = 75694080.

The previous prime is 208215037. The next prime is 208215047. The reversal of 208215040 is 40512802.

It is a tau number, because it is divible by the number of its divisors (88).

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (208215047) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 54472 + ... + 58168.

Almost surely, 2^208215040 is an apocalyptic number.

208215040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 208215040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (272513016).

208215040 is an abundant number, since it is smaller than the sum of its proper divisors (336810992).

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

208215040 is a wasteful number, since it uses less digits than its factorization.

208215040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3733 (or 3715 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 22.

The square root of 208215040 is about 14429.6583466138. The cubic root of 208215040 is about 592.7033277012.

Adding to 208215040 its reverse (40512802), we get a palindrome (248727842).

The spelling of 208215040 in words is "two hundred eight million, two hundred fifteen thousand, forty".