997628308 has 24 divisors (see below), whose sum is σ = 1775075400. Its totient is φ = 490531200.

The previous prime is 997628287. The next prime is 997628309. The reversal of 997628308 is 803826799.

It can be written as a sum of positive squares in 4 ways, for example, as 282172804 + 715455504 = 16798^2 + 26748^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (997628309) 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 7 ways as a sum of consecutive naturals, for example, 51910 + ... + 68482.

It is an arithmetic number, because the mean of its divisors is an integer number (73961475).

Almost surely, 2^997628308 is an apocalyptic number.

It is an amenable number.

997628308 is a deficient number, since it is larger than the sum of its proper divisors (777447092).

997628308 is a wasteful number, since it uses less digits than its factorization.

997628308 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16827 (or 16825 counting only the distinct ones).

The product of its (nonzero) digits is 1306368, while the sum is 52.

The square root of 997628308 is about 31585.2545976758. The cubic root of 997628308 is about 999.2088101838.

The spelling of 997628308 in words is "nine hundred ninety-seven million, six hundred twenty-eight thousand, three hundred eight".