1643760468 has 54 divisors (see below), whose sum is σ = 4833443706. Its totient is φ = 469645344.

The previous prime is 1643760463. The next prime is 1643760511. The reversal of 1643760468 is 8640673461.

It is a happy number.

1643760468 is a `hidden beast` number, since 1 + 6 + 4 + 37 + 604 + 6 + 8 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1112089104 + 531671364 = 33348^2 + 23058^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1643760463) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 464155 + ... + 467682.

Almost surely, 2^1643760468 is an apocalyptic number.

1643760468 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

1643760468 is an abundant number, since it is smaller than the sum of its proper divisors (3189683238).

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

1643760468 is a wasteful number, since it uses less digits than its factorization.

1643760468 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 931861 (or 931849 counting only the distinct ones).

The product of its (nonzero) digits is 580608, while the sum is 45.

The square root of 1643760468 is about 40543.3159472681. The cubic root of 1643760468 is about 1180.1743656915.

The spelling of 1643760468 in words is "one billion, six hundred forty-three million, seven hundred sixty thousand, four hundred sixty-eight".