1997968620 has 24 divisors (see below), whose sum is σ = 5594312304. Its totient is φ = 532791616.

The previous prime is 1997968619. The next prime is 1997968627. The reversal of 1997968620 is 268697991.

It is not an unprimeable number, because it can be changed into a prime (1997968627) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 16649679 + ... + 16649798.

It is an arithmetic number, because the mean of its divisors is an integer number (233096346).

Almost surely, 2^1997968620 is an apocalyptic number.

1997968620 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1997968620 is an abundant number, since it is smaller than the sum of its proper divisors (3596343684).

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

1997968620 is a wasteful number, since it uses less digits than its factorization.

1997968620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33299489 (or 33299487 counting only the distinct ones).

The product of its (nonzero) digits is 2939328, while the sum is 57.

The square root of 1997968620 is about 44698.6422612589. The cubic root of 1997968620 is about 1259.4943423243.

The spelling of 1997968620 in words is "one billion, nine hundred ninety-seven million, nine hundred sixty-eight thousand, six hundred twenty".