997388780 has 24 divisors (see below), whose sum is σ = 2123211552. Its totient is φ = 393489792.

The previous prime is 997388779. The next prime is 997388789. The reversal of 997388780 is 87883799.

It is not an unprimeable number, because it can be changed into a prime (997388789) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 340112 + ... + 343031.

It is an arithmetic number, because the mean of its divisors is an integer number (88467148).

Almost surely, 2^997388780 is an apocalyptic number.

It is an amenable number.

997388780 is an abundant number, since it is smaller than the sum of its proper divisors (1125822772).

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

997388780 is a wasteful number, since it uses less digits than its factorization.

997388780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 683225 (or 683223 counting only the distinct ones).

The product of its (nonzero) digits is 6096384, while the sum is 59.

The square root of 997388780 is about 31581.4626007093. The cubic root of 997388780 is about 999.1288346246.

The spelling of 997388780 in words is "nine hundred ninety-seven million, three hundred eighty-eight thousand, seven hundred eighty".