1644051490 has 8 divisors (see below), whose sum is σ = 2959292700. Its totient is φ = 657620592.

The previous prime is 1644051473. The next prime is 1644051503. The reversal of 1644051490 is 941504461.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1565072721 + 78978769 = 39561^2 + 8887^2 .

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

It is a super-3 number, since 3×1644051490³ (a number of 29 digits) contains 333 as substring.

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, 82202565 + ... + 82202584.

Almost surely, 2^1644051490 is an apocalyptic number.

1644051490 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1644051490 is a deficient number, since it is larger than the sum of its proper divisors (1315241210).

1644051490 is a wasteful number, since it uses less digits than its factorization.

1644051490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164405156.

The product of its (nonzero) digits is 17280, while the sum is 34.

The square root of 1644051490 is about 40546.9048140545. The cubic root of 1644051490 is about 1180.2440101529.

The spelling of 1644051490 in words is "one billion, six hundred forty-four million, fifty-one thousand, four hundred ninety".