155220208 has 80 divisors (see below), whose sum is σ = 356227200. Its totient is φ = 64592640.

The previous prime is 155220187. The next prime is 155220211. The reversal of 155220208 is 802022551.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 409363 + ... + 409741.

It is an arithmetic number, because the mean of its divisors is an integer number (4452840).

Almost surely, 2^155220208 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 155220208, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (178113600).

155220208 is an abundant number, since it is smaller than the sum of its proper divisors (201006992).

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

155220208 is a wasteful number, since it uses less digits than its factorization.

155220208 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 590 (or 584 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 25.

The square root of 155220208 is about 12458.7402252395. The cubic root of 155220208 is about 537.4227996569.

Adding to 155220208 its reverse (802022551), we get a palindrome (957242759).

The spelling of 155220208 in words is "one hundred fifty-five million, two hundred twenty thousand, two hundred eight".