1643040260 has 24 divisors (see below), whose sum is σ = 3508868160. Its totient is φ = 646076384.

The previous prime is 1643040253. The next prime is 1643040317. The reversal of 1643040260 is 620403461.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 695024 + ... + 697383.

It is an arithmetic number, because the mean of its divisors is an integer number (146202840).

Almost surely, 2^1643040260 is an apocalyptic number.

1643040260 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1643040260 is an abundant number, since it is smaller than the sum of its proper divisors (1865827900).

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

1643040260 is a wasteful number, since it uses less digits than its factorization.

1643040260 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1392475 (or 1392473 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 26.

The square root of 1643040260 is about 40534.4330168808. The cubic root of 1643040260 is about 1180.0019773978.

The spelling of 1643040260 in words is "one billion, six hundred forty-three million, forty thousand, two hundred sixty".