997795287 has 32 divisors (see below), whose sum is σ = 1499904000. Its totient is φ = 655490880.

The previous prime is 997795283. The next prime is 997795301. The reversal of 997795287 is 782597799.

It is not a de Polignac number, because 997795287 - 2² = 997795283 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (997795283) 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 31 ways as a sum of consecutive naturals, for example, 1006362 + ... + 1007352.

It is an arithmetic number, because the mean of its divisors is an integer number (46872000).

Almost surely, 2^997795287 is an apocalyptic number.

997795287 is a deficient number, since it is larger than the sum of its proper divisors (502108713).

997795287 is a wasteful number, since it uses less digits than its factorization.

997795287 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1508 (or 1502 counting only the distinct ones).

The product of its digits is 20003760, while the sum is 63.

The square root of 997795287 is about 31587.8977933005. The cubic root of 997795287 is about 999.2645549198.

The spelling of 997795287 in words is "nine hundred ninety-seven million, seven hundred ninety-five thousand, two hundred eighty-seven".