1997210064 has 20 divisors (see below), whose sum is σ = 5159459456. Its totient is φ = 665736672.

The previous prime is 1997210053. The next prime is 1997210143. The reversal of 1997210064 is 4600127991.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20804224 + ... + 20804319.

Almost surely, 2^1997210064 is an apocalyptic number.

It is an amenable number.

1997210064 is an abundant number, since it is smaller than the sum of its proper divisors (3162249392).

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

1997210064 is a wasteful number, since it uses less digits than its factorization.

1997210064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41608554 (or 41608548 counting only the distinct ones).

The product of its (nonzero) digits is 27216, while the sum is 39.

The square root of 1997210064 is about 44690.1562315461. The cubic root of 1997210064 is about 1259.3349274206.

The spelling of 1997210064 in words is "one billion, nine hundred ninety-seven million, two hundred ten thousand, sixty-four".