997628865 has 16 divisors (see below), whose sum is σ = 1597041600. Its totient is φ = 531790272.

The previous prime is 997628791. The next prime is 997628869. The reversal of 997628865 is 568826799.

It is a happy number.

It is not a de Polignac number, because 997628865 - 2²⁷ = 863411137 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 997628799 and 997628808.

It is not an unprimeable number, because it can be changed into a prime (997628869) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14046 + ... + 46824.

It is an arithmetic number, because the mean of its divisors is an integer number (99815100).

Almost surely, 2^997628865 is an apocalyptic number.

It is an amenable number.

997628865 is a deficient number, since it is larger than the sum of its proper divisors (599412735).

997628865 is a wasteful number, since it uses less digits than its factorization.

997628865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34816.

The product of its digits is 13063680, while the sum is 60.

The square root of 997628865 is about 31585.2634150801. The cubic root of 997628865 is about 999.2089961445.

The spelling of 997628865 in words is "nine hundred ninety-seven million, six hundred twenty-eight thousand, eight hundred sixty-five".