155222144 has 64 divisors (see below), whose sum is σ = 385560000. Its totient is φ = 60472320.

The previous prime is 155222143. The next prime is 155222173. The reversal of 155222144 is 441222551.

It is a tau number, because it is divible by the number of its divisors (64).

It is not an unprimeable number, because it can be changed into a prime (155222143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1982 + ... + 17730.

It is an arithmetic number, because the mean of its divisors is an integer number (6024375).

Almost surely, 2^155222144 is an apocalyptic number.

155222144 is a gapful number since it is divisible by the number (14) 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 155222144, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (192780000).

155222144 is an abundant number, since it is smaller than the sum of its proper divisors (230337856).

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

155222144 is a wasteful number, since it uses less digits than its factorization.

155222144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15781 (or 15769 counting only the distinct ones).

The product of its digits is 3200, while the sum is 26.

The square root of 155222144 is about 12458.8179214563. The cubic root of 155222144 is about 537.4250340013.

Adding to 155222144 its reverse (441222551), we get a palindrome (596444695).

The spelling of 155222144 in words is "one hundred fifty-five million, two hundred twenty-two thousand, one hundred forty-four".