997766648 has 16 divisors (see below), whose sum is σ = 1871301960. Its totient is φ = 498752800.

The previous prime is 997766647. The next prime is 997766677. The reversal of 997766648 is 846667799.

It is a super-2 number, since 2×997766648² = 1991076567722311808, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (997766647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21263 + ... + 49473.

Almost surely, 2^997766648 is an apocalyptic number.

It is an amenable number.

997766648 is a deficient number, since it is larger than the sum of its proper divisors (873535312).

997766648 is a wasteful number, since it uses less digits than its factorization.

997766648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32638 (or 32634 counting only the distinct ones).

The product of its digits is 27433728, while the sum is 62.

The square root of 997766648 is about 31587.4444676995. Note that the first 4 decimals coincide. The cubic root of 997766648 is about 999.2549944379.

The spelling of 997766648 in words is "nine hundred ninety-seven million, seven hundred sixty-six thousand, six hundred forty-eight".