997898772 has 96 divisors (see below), whose sum is σ = 2654467200. Its totient is φ = 289239552.

The previous prime is 997898771. The next prime is 997898777. The reversal of 997898772 is 277898799.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (997898771) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 583054 + ... + 584762.

It is an arithmetic number, because the mean of its divisors is an integer number (27650700).

Almost surely, 2^997898772 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 997898772, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1327233600).

997898772 is an abundant number, since it is smaller than the sum of its proper divisors (1656568428).

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

997898772 is a wasteful number, since it uses less digits than its factorization.

997898772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1945 (or 1943 counting only the distinct ones).

The product of its digits is 32006016, while the sum is 66.

The square root of 997898772 is about 31589.5357990585. The cubic root of 997898772 is about 999.2990995200.

The spelling of 997898772 in words is "nine hundred ninety-seven million, eight hundred ninety-eight thousand, seven hundred seventy-two".