997628018 has 4 divisors (see below), whose sum is σ = 1496442030. Its totient is φ = 498814008.

The previous prime is 997627979. The next prime is 997628069. The reversal of 997628018 is 810826799.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 997485889 + 142129 = 31583^2 + 377^2 .

It is a Curzon number.

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 as a sum of consecutive naturals, namely, 249407003 + ... + 249407006.

Almost surely, 2^997628018 is an apocalyptic number.

997628018 is a deficient number, since it is larger than the sum of its proper divisors (498814012).

997628018 is a wasteful number, since it uses less digits than its factorization.

997628018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 498814011.

The product of its (nonzero) digits is 435456, while the sum is 50.

The square root of 997628018 is about 31585.2500069257. The cubic root of 997628018 is about 999.2087133639.

The spelling of 997628018 in words is "nine hundred ninety-seven million, six hundred twenty-eight thousand, eighteen".