145452220 has 24 divisors (see below), whose sum is σ = 321526800. Its totient is φ = 55118592.

The previous prime is 145452149. The next prime is 145452247. The reversal of 145452220 is 22254541.

It is a congruent number.

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, 191005 + ... + 191764.

It is an arithmetic number, because the mean of its divisors is an integer number (13396950).

Almost surely, 2^145452220 is an apocalyptic number.

145452220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

145452220 is an abundant number, since it is smaller than the sum of its proper divisors (176074580).

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

145452220 is a wasteful number, since it uses less digits than its factorization.

145452220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 382797 (or 382795 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 25.

The square root of 145452220 is about 12060.3573744728. The cubic root of 145452220 is about 525.9043762039.

The spelling of 145452220 in words is "one hundred forty-five million, four hundred fifty-two thousand, two hundred twenty".