1644794481 has 8 divisors (see below), whose sum is σ = 2392428384. Its totient is φ = 996845120.

The previous prime is 1644794467. The next prime is 1644794491. The reversal of 1644794481 is 1844974461.

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

It is a cyclic number.

It is not a de Polignac number, because 1644794481 - 2¹¹ = 1644792433 is a prime.

It is a super-2 number, since 2×1644794481² = 5410697769456118722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1644794481.

It is not an unprimeable number, because it can be changed into a prime (1644794491) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24921096 + ... + 24921161.

It is an arithmetic number, because the mean of its divisors is an integer number (299053548).

Almost surely, 2^1644794481 is an apocalyptic number.

1644794481 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1644794481 is a deficient number, since it is larger than the sum of its proper divisors (747633903).

1644794481 is a wasteful number, since it uses less digits than its factorization.

1644794481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49842271.

The product of its digits is 774144, while the sum is 48.

The square root of 1644794481 is about 40556.0658964846. The cubic root of 1644794481 is about 1180.4217780261.

The spelling of 1644794481 in words is "one billion, six hundred forty-four million, seven hundred ninety-four thousand, four hundred eighty-one".