1445749664 has 24 divisors (see below), whose sum is σ = 2851289028. Its totient is φ = 721612800.

The previous prime is 1445749639. The next prime is 1445749687. The reversal of 1445749664 is 4669475441.

It can be written as a sum of positive squares in 2 ways, for example, as 1427328400 + 18421264 = 37780^2 + 4292^2 .

It is a super-2 number, since 2×1445749664² = 4180384181912225792, which contains 22 as substring.

It is an unprimeable number.

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, 20687 + ... + 57614.

Almost surely, 2^1445749664 is an apocalyptic number.

It is an amenable number.

1445749664 is a deficient number, since it is larger than the sum of its proper divisors (1405539364).

1445749664 is an equidigital number, since it uses as much as digits as its factorization.

1445749664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78888 (or 78880 counting only the distinct ones).

The product of its digits is 2903040, while the sum is 50.

The square root of 1445749664 is about 38023.0149251739. The cubic root of 1445749664 is about 1130.7441945648.

The spelling of 1445749664 in words is "one billion, four hundred forty-five million, seven hundred forty-nine thousand, six hundred sixty-four".