1643428683 has 48 divisors (see below), whose sum is σ = 2766516480. Its totient is φ = 967326624.

The previous prime is 1643428679. The next prime is 1643428687. The reversal of 1643428683 is 3868243461.

1643428683 is a `hidden beast` number, since 164 + 3 + 428 + 68 + 3 = 666.

It is an interprime number because it is at equal distance from previous prime (1643428679) and next prime (1643428687).

It is not a de Polignac number, because 1643428683 - 2² = 1643428679 is a prime.

It is a super-2 number, since 2×1643428683² = 5401715672214228978, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1643428687) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 61348 + ... + 83966.

It is an arithmetic number, because the mean of its divisors is an integer number (57635760).

Almost surely, 2^1643428683 is an apocalyptic number.

1643428683 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1643428683 is a deficient number, since it is larger than the sum of its proper divisors (1123087797).

1643428683 is a wasteful number, since it uses less digits than its factorization.

1643428683 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22670 (or 22658 counting only the distinct ones).

The product of its digits is 663552, while the sum is 45.

The square root of 1643428683 is about 40539.2240058934. The cubic root of 1643428683 is about 1180.0949562099.

The spelling of 1643428683 in words is "one billion, six hundred forty-three million, four hundred twenty-eight thousand, six hundred eighty-three".