144220928 has 72 divisors (see below), whose sum is σ = 314939520. Its totient is φ = 65617920.

The previous prime is 144220919. The next prime is 144220943. The reversal of 144220928 is 829022441.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a junction number, because it is equal to n+sod(n) for n = 144220894 and 144220903.

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, 134378 + ... + 135446.

It is an arithmetic number, because the mean of its divisors is an integer number (4374160).

Almost surely, 2^144220928 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 144220928, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (157469760).

144220928 is an abundant number, since it is smaller than the sum of its proper divisors (170718592).

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

144220928 is a wasteful number, since it uses less digits than its factorization.

144220928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1133 (or 1119 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 32.

The square root of 144220928 is about 12009.2018052825. The cubic root of 144220928 is about 524.4161951864.

The spelling of 144220928 in words is "one hundred forty-four million, two hundred twenty thousand, nine hundred twenty-eight".