1649408688 has 60 divisors (see below), whose sum is σ = 4632829968. Its totient is φ = 547804800.

The previous prime is 1649408659. The next prime is 1649408699. The reversal of 1649408688 is 8868049461.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 19213 + ... + 60563.

Almost surely, 2^1649408688 is an apocalyptic number.

1649408688 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1649408688, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2316414984).

1649408688 is an abundant number, since it is smaller than the sum of its proper divisors (2983421280).

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

1649408688 is a wasteful number, since it uses less digits than its factorization.

1649408688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41642 (or 41633 counting only the distinct ones).

The product of its (nonzero) digits is 2654208, while the sum is 54.

The square root of 1649408688 is about 40612.9128233866. The cubic root of 1649408688 is about 1181.5245753921.

The spelling of 1649408688 in words is "one billion, six hundred forty-nine million, four hundred eight thousand, six hundred eighty-eight".