145222728 has 64 divisors (see below), whose sum is σ = 416040960. Its totient is φ = 41380416.

The previous prime is 145222717. The next prime is 145222751. The reversal of 145222728 is 827222541.

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 15 ways as a sum of consecutive naturals, for example, 76851 + ... + 78717.

It is an arithmetic number, because the mean of its divisors is an integer number (6500640).

Almost surely, 2^145222728 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 145222728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (208020480).

145222728 is an abundant number, since it is smaller than the sum of its proper divisors (270818232).

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

145222728 is a wasteful number, since it uses less digits than its factorization.

145222728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2346 (or 2342 counting only the distinct ones).

The product of its digits is 17920, while the sum is 33.

The square root of 145222728 is about 12050.8393068699. The cubic root of 145222728 is about 525.6276429980.

The spelling of 145222728 in words is "one hundred forty-five million, two hundred twenty-two thousand, seven hundred twenty-eight".