997802208 has 144 divisors (see below), whose sum is σ = 3154709376. Its totient is φ = 297077760.

The previous prime is 997802207. The next prime is 997802209. The reversal of 997802208 is 802208799.

It is an interprime number because it is at equal distance from previous prime (997802207) and next prime (997802209).

It is a tau number, because it is divible by the number of its divisors (144).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (997802203) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 111766 + ... + 120362.

It is an arithmetic number, because the mean of its divisors is an integer number (21907704).

Almost surely, 2^997802208 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 997802208, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1577354688).

997802208 is an abundant number, since it is smaller than the sum of its proper divisors (2156907168).

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

997802208 is a wasteful number, since it uses less digits than its factorization.

997802208 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8657 (or 8646 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 45.

The square root of 997802208 is about 31588.0073445604. The cubic root of 997802208 is about 999.2668653115.

The spelling of 997802208 in words is "nine hundred ninety-seven million, eight hundred two thousand, two hundred eight".