145225220 has 144 divisors (see below), whose sum is σ = 392999040. Its totient is φ = 44706816.

The previous prime is 145225219. The next prime is 145225231. The reversal of 145225220 is 22522541.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 382991 + ... + 383369.

It is an arithmetic number, because the mean of its divisors is an integer number (2729160).

Almost surely, 2^145225220 is an apocalyptic number.

145225220 is a gapful number since it is divisible by the number (10) 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 145225220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (196499520).

145225220 is an abundant number, since it is smaller than the sum of its proper divisors (247773820).

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

145225220 is a wasteful number, since it uses less digits than its factorization.

145225220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 442 (or 433 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 23.

The square root of 145225220 is about 12050.9427017143. The cubic root of 145225220 is about 525.6306495444.

Adding to 145225220 its reverse (22522541), we get a palindrome (167747761).

The spelling of 145225220 in words is "one hundred forty-five million, two hundred twenty-five thousand, two hundred twenty".