997720800 has 72 divisors (see below), whose sum is σ = 3247589016. Its totient is φ = 266058240.

The previous prime is 997720793. The next prime is 997720807. The reversal of 997720800 is 8027799.

It is an interprime number because it is at equal distance from previous prime (997720793) and next prime (997720807).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (997720807) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 205459 + ... + 210258.

It is an arithmetic number, because the mean of its divisors is an integer number (45105403).

Almost surely, 2^997720800 is an apocalyptic number.

It is an amenable number.

997720800 is an abundant number, since it is smaller than the sum of its proper divisors (2249868216).

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

997720800 is a wasteful number, since it uses less digits than its factorization.

997720800 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 415740 (or 415727 counting only the distinct ones).

The product of its (nonzero) digits is 63504, while the sum is 42.

The square root of 997720800 is about 31586.7187279717. The cubic root of 997720800 is about 999.2396887400.

The spelling of 997720800 in words is "nine hundred ninety-seven million, seven hundred twenty thousand, eight hundred".