1445273664 has 28 divisors (see below), whose sum is σ = 3823953744. Its totient is φ = 481757824.

The previous prime is 1445273663. The next prime is 1445273689. The reversal of 1445273664 is 4663725441.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (1445273663) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3763542 + ... + 3763925.

Almost surely, 2^1445273664 is an apocalyptic number.

It is an amenable number.

1445273664 is an abundant number, since it is smaller than the sum of its proper divisors (2378680080).

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

1445273664 is an equidigital number, since it uses as much as digits as its factorization.

1445273664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7527482 (or 7527472 counting only the distinct ones).

The product of its digits is 483840, while the sum is 42.

The square root of 1445273664 is about 38016.7550430070. The cubic root of 1445273664 is about 1130.6200851770.

The spelling of 1445273664 in words is "one billion, four hundred forty-five million, two hundred seventy-three thousand, six hundred sixty-four".