145320224 has 48 divisors (see below), whose sum is σ = 331486848. Its totient is φ = 61420032.

The previous prime is 145320211. The next prime is 145320251. The reversal of 145320224 is 422023541.

It is a happy number.

It is a super-2 number, since 2×145320224² = 42235935006820352, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 145320224.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11909 + ... + 20795.

It is an arithmetic number, because the mean of its divisors is an integer number (6905976).

Almost surely, 2^145320224 is an apocalyptic number.

145320224 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 145320224, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (165743424).

145320224 is an abundant number, since it is smaller than the sum of its proper divisors (186166624).

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

145320224 is an equidigital number, since it uses as much as digits as its factorization.

145320224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8977 (or 8969 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 23.

The square root of 145320224 is about 12054.8838235796. The cubic root of 145320224 is about 525.7452442611.

Adding to 145320224 its reverse (422023541), we get a palindrome (567343765).

The spelling of 145320224 in words is "one hundred forty-five million, three hundred twenty thousand, two hundred twenty-four".