1063446640 has 20 divisors (see below), whose sum is σ = 2472513624. Its totient is φ = 425378624.

The previous prime is 1063446623. The next prime is 1063446667. The reversal of 1063446640 is 466443601.

It is a tau number, because it is divible by the number of its divisors (20).

It is a super-2 number, since 2×1063446640² = 2261837512254579200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1063446596 and 1063446605.

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, 6646462 + ... + 6646621.

Almost surely, 2^1063446640 is an apocalyptic number.

1063446640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1063446640 is an abundant number, since it is smaller than the sum of its proper divisors (1409066984).

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

1063446640 is a wasteful number, since it uses less digits than its factorization.

1063446640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13293096 (or 13293090 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 34.

The square root of 1063446640 is about 32610.5295878494. The cubic root of 1063446640 is about 1020.7167332084.

The spelling of 1063446640 in words is "one billion, sixty-three million, four hundred forty-six thousand, six hundred forty".