1644016442 has 8 divisors (see below), whose sum is σ = 2526171732. Its totient is φ = 801959200.

The previous prime is 1644016391. The next prime is 1644016469. The reversal of 1644016442 is 2446104461.

It can be written as a sum of positive squares in 2 ways, for example, as 1440126601 + 203889841 = 37949^2 + 14279^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-3 number, since 3×1644016442³ (a number of 29 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1644016399 and 1644016408.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10024409 + ... + 10024572.

Almost surely, 2^1644016442 is an apocalyptic number.

1644016442 is a deficient number, since it is larger than the sum of its proper divisors (882155290).

1644016442 is a wasteful number, since it uses less digits than its factorization.

1644016442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20049024.

The product of its (nonzero) digits is 18432, while the sum is 32.

The square root of 1644016442 is about 40546.4726209321. The cubic root of 1644016442 is about 1180.2356232529.

The spelling of 1644016442 in words is "one billion, six hundred forty-four million, sixteen thousand, four hundred forty-two".