1445689664 has 28 divisors (see below), whose sum is σ = 2908098324. Its totient is φ = 712940544.

The previous prime is 1445689657. The next prime is 1445689699. The reversal of 1445689664 is 4669865441.

It can be written as a sum of positive squares in 2 ways, for example, as 859662400 + 586027264 = 29320^2 + 24208^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 150047 + ... + 159390.

Almost surely, 2^1445689664 is an apocalyptic number.

It is an amenable number.

1445689664 is an abundant number, since it is smaller than the sum of its proper divisors (1462408660).

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

1445689664 is an equidigital number, since it uses as much as digits as its factorization.

1445689664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 309522 (or 309512 counting only the distinct ones).

The product of its digits is 4976640, while the sum is 53.

The square root of 1445689664 is about 38022.2259211635. The cubic root of 1445689664 is about 1130.7285520249.

The spelling of 1445689664 in words is "one billion, four hundred forty-five million, six hundred eighty-nine thousand, six hundred sixty-four".