1640253648 has 160 divisors (see below), whose sum is σ = 4980252672. Its totient is φ = 459993600.

The previous prime is 1640253613. The next prime is 1640253661. The reversal of 1640253648 is 8463520461.

It is a zygodrome in base 15.

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 31 ways as a sum of consecutive naturals, for example, 374286 + ... + 378642.

Almost surely, 2^1640253648 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1640253648, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2490126336).

1640253648 is an abundant number, since it is smaller than the sum of its proper divisors (3339999024).

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

1640253648 is a wasteful number, since it uses less digits than its factorization.

1640253648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4433 (or 4427 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 39.

The square root of 1640253648 is about 40500.0450370120. The cubic root of 1640253648 is about 1179.3345016928.

The spelling of 1640253648 in words is "one billion, six hundred forty million, two hundred fifty-three thousand, six hundred forty-eight".