997447647 has 64 divisors (see below), whose sum is σ = 1688961024. Its totient is φ = 510174720.

The previous prime is 997447639. The next prime is 997447657. The reversal of 997447647 is 746744799.

It is not a de Polignac number, because 997447647 - 2³ = 997447639 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (997447657) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2717658 + ... + 2718024.

It is an arithmetic number, because the mean of its divisors is an integer number (26390016).

Almost surely, 2^997447647 is an apocalyptic number.

997447647 is a deficient number, since it is larger than the sum of its proper divisors (691513377).

997447647 is a wasteful number, since it uses less digits than its factorization.

997447647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 748.

The product of its digits is 10668672, while the sum is 57.

The square root of 997447647 is about 31582.3945735595. The cubic root of 997447647 is about 999.1484908046.

The spelling of 997447647 in words is "nine hundred ninety-seven million, four hundred forty-seven thousand, six hundred forty-seven".