997447648 has 12 divisors (see below), whose sum is σ = 1963725120. Its totient is φ = 498723808.

The previous prime is 997447639. The next prime is 997447657. The reversal of 997447648 is 846744799.

It is an interprime number because it is at equal distance from previous prime (997447639) and next prime (997447657).

It is a junction number, because it is equal to n+sod(n) for n = 997447592 and 997447601.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 15585088 + ... + 15585151.

It is an arithmetic number, because the mean of its divisors is an integer number (163643760).

Almost surely, 2^997447648 is an apocalyptic number.

997447648 is the 16882-nd centered heptagonal number.

It is an amenable number.

997447648 is a deficient number, since it is larger than the sum of its proper divisors (966277472).

997447648 is a wasteful number, since it uses less digits than its factorization.

997447648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31170249 (or 31170241 counting only the distinct ones).

The product of its digits is 12192768, while the sum is 58.

The square root of 997447648 is about 31582.3945893911. The cubic root of 997447648 is about 999.1484911385.

The spelling of 997447648 in words is "nine hundred ninety-seven million, four hundred forty-seven thousand, six hundred forty-eight".