1649681360 has 60 divisors (see below), whose sum is σ = 4074456108. Its totient is φ = 621047808.

The previous prime is 1649681351. The next prime is 1649681419. The reversal of 1649681360 is 631869461.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 506430016 + 1143251344 = 22504^2 + 33812^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12557 + ... + 58796.

Almost surely, 2^1649681360 is an apocalyptic number.

1649681360 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1649681360 is an abundant number, since it is smaller than the sum of its proper divisors (2424774748).

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

1649681360 is a wasteful number, since it uses less digits than its factorization.

1649681360 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71400 (or 71377 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 44.

The square root of 1649681360 is about 40616.2696465345. The cubic root of 1649681360 is about 1181.5896797170.

The spelling of 1649681360 in words is "one billion, six hundred forty-nine million, six hundred eighty-one thousand, three hundred sixty".