1649744775 has 72 divisors (see below), whose sum is σ = 3383974880. Its totient is φ = 752613120.

The previous prime is 1649744773. The next prime is 1649744777. The reversal of 1649744775 is 5774479461.

It is a happy number.

1649744775 is a `hidden beast` number, since 164 + 9 + 7 + 4 + 477 + 5 = 666.

It is an interprime number because it is at equal distance from previous prime (1649744773) and next prime (1649744777).

It is not a de Polignac number, because 1649744775 - 2¹ = 1649744773 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1649744771) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 1153761 + ... + 1155189.

Almost surely, 2^1649744775 is an apocalyptic number.

1649744775 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1649744775 is an abundant number, since it is smaller than the sum of its proper divisors (1734230105).

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

1649744775 is a wasteful number, since it uses less digits than its factorization.

1649744775 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2185 (or 2177 counting only the distinct ones).

The product of its digits is 5927040, while the sum is 54.

The square root of 1649744775 is about 40617.0502991047. The cubic root of 1649744775 is about 1181.6048199235.

The spelling of 1649744775 in words is "one billion, six hundred forty-nine million, seven hundred forty-four thousand, seven hundred seventy-five".