1997632648 has 64 divisors (see below), whose sum is σ = 4142819520. Its totient is φ = 895488000.

The previous prime is 1997632613. The next prime is 1997632649. The reversal of 1997632648 is 8462367991.

It is not an unprimeable number, because it can be changed into a prime (1997632649) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3323548 + ... + 3324148.

It is an arithmetic number, because the mean of its divisors is an integer number (64731555).

Almost surely, 2^1997632648 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 1997632648, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2071409760).

1997632648 is an abundant number, since it is smaller than the sum of its proper divisors (2145186872).

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

1997632648 is a wasteful number, since it uses less digits than its factorization.

1997632648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1078 (or 1074 counting only the distinct ones).

The product of its digits is 3919104, while the sum is 55.

The square root of 1997632648 is about 44694.8839130386. The cubic root of 1997632648 is about 1259.4237408561.

The spelling of 1997632648 in words is "one billion, nine hundred ninety-seven million, six hundred thirty-two thousand, six hundred forty-eight".