145533220 has 48 divisors (see below), whose sum is σ = 360557568. Its totient is φ = 48286080.

The previous prime is 145533211. The next prime is 145533221. The reversal of 145533220 is 22335541.

It is not an unprimeable number, because it can be changed into a prime (145533221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12427 + ... + 21106.

It is an arithmetic number, because the mean of its divisors is an integer number (7511616).

Almost surely, 2^145533220 is an apocalyptic number.

145533220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

145533220 is an abundant number, since it is smaller than the sum of its proper divisors (215024348).

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

145533220 is a wasteful number, since it uses less digits than its factorization.

145533220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33580 (or 33578 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 25.

The square root of 145533220 is about 12063.7150165279. The cubic root of 145533220 is about 526.0019806486.

Adding to 145533220 its reverse (22335541), we get a palindrome (167868761).

The spelling of 145533220 in words is "one hundred forty-five million, five hundred thirty-three thousand, two hundred twenty".