1649471508 has 36 divisors (see below), whose sum is σ = 4177735380. Its totient is φ = 548737536.

The previous prime is 1649471497. The next prime is 1649471513. The reversal of 1649471508 is 8051749461.

1649471508 is a `hidden beast` number, since 1 + 6 + 494 + 7 + 150 + 8 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1413910404 + 235561104 = 37602^2 + 15348^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 26685 + ... + 63332.

It is an arithmetic number, because the mean of its divisors is an integer number (116048205).

Almost surely, 2^1649471508 is an apocalyptic number.

1649471508 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

1649471508 is an abundant number, since it is smaller than the sum of its proper divisors (2528263872).

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

1649471508 is a wasteful number, since it uses less digits than its factorization.

1649471508 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90536 (or 90531 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 45.

The square root of 1649471508 is about 40613.6862153634. The cubic root of 1649471508 is about 1181.5395751982.

The spelling of 1649471508 in words is "one billion, six hundred forty-nine million, four hundred seventy-one thousand, five hundred eight".