1440621664 has 24 divisors (see below), whose sum is σ = 2845363248. Its totient is φ = 717989760.

The previous prime is 1440621631. The next prime is 1440621671. The reversal of 1440621664 is 4661260441.

It is a super-2 number, since 2×1440621664² = 4150781557572257792, which contains 22 as substring.

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, 62427 + ... + 82330.

It is an arithmetic number, because the mean of its divisors is an integer number (118556802).

Almost surely, 2^1440621664 is an apocalyptic number.

It is an amenable number.

1440621664 is a deficient number, since it is larger than the sum of its proper divisors (1404741584).

1440621664 is a wasteful number, since it uses less digits than its factorization.

1440621664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145078 (or 145070 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 34.

The square root of 1440621664 is about 37955.5221805734. The cubic root of 1440621664 is about 1129.4057135620.

The spelling of 1440621664 in words is "one billion, four hundred forty million, six hundred twenty-one thousand, six hundred sixty-four".