1445642720 has 24 divisors (see below), whose sum is σ = 3415331304. Its totient is φ = 578257024.

The previous prime is 1445642689. The next prime is 1445642729. The reversal of 1445642720 is 272465441.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1445642729) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 4517474 + ... + 4517793.

It is an arithmetic number, because the mean of its divisors is an integer number (142305471).

Almost surely, 2^1445642720 is an apocalyptic number.

1445642720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1445642720 is an abundant number, since it is smaller than the sum of its proper divisors (1969688584).

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

1445642720 is an equidigital number, since it uses as much as digits as its factorization.

1445642720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9035282 (or 9035274 counting only the distinct ones).

The product of its (nonzero) digits is 53760, while the sum is 35.

The square root of 1445642720 is about 38021.6085930093. The cubic root of 1445642720 is about 1130.7163129999.

The spelling of 1445642720 in words is "one billion, four hundred forty-five million, six hundred forty-two thousand, seven hundred twenty".