145566220 has 24 divisors (see below), whose sum is σ = 321778800. Its totient is φ = 55161792.

The previous prime is 145566217. The next prime is 145566227. The reversal of 145566220 is 22665541.

It is not an unprimeable number, because it can be changed into a prime (145566227) 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 7 ways as a sum of consecutive naturals, for example, 191155 + ... + 191914.

It is an arithmetic number, because the mean of its divisors is an integer number (13407450).

Almost surely, 2^145566220 is an apocalyptic number.

145566220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

145566220 is an abundant number, since it is smaller than the sum of its proper divisors (176212580).

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

145566220 is a wasteful number, since it uses less digits than its factorization.

145566220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 383097 (or 383095 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 31.

The square root of 145566220 is about 12065.0826768821. The cubic root of 145566220 is about 526.0417350395.

The spelling of 145566220 in words is "one hundred forty-five million, five hundred sixty-six thousand, two hundred twenty".