997608780 has 144 divisors (see below), whose sum is σ = 3470987520. Its totient is φ = 227193984.

The previous prime is 997608769. The next prime is 997608797. The reversal of 997608780 is 87806799.

It is an unprimeable number.

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 47 ways as a sum of consecutive naturals, for example, 385531 + ... + 388109.

It is an arithmetic number, because the mean of its divisors is an integer number (24104080).

Almost surely, 2^997608780 is an apocalyptic number.

997608780 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 997608780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1735493760).

997608780 is an abundant number, since it is smaller than the sum of its proper divisors (2473378740).

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

997608780 is a wasteful number, since it uses less digits than its factorization.

997608780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2908 (or 2903 counting only the distinct ones).

The product of its (nonzero) digits is 1524096, while the sum is 54.

The square root of 997608780 is about 31584.9454645722. The cubic root of 997608780 is about 999.2022904954.

The spelling of 997608780 in words is "nine hundred ninety-seven million, six hundred eight thousand, seven hundred eighty".