997628 has 18 divisors (see below), whose sum is σ = 1856736. Its totient is φ = 468928.

The previous prime is 997627. The next prime is 997637. The reversal of 997628 is 826799.

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (997627) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 725 + ... + 1587.

It is an arithmetic number, because the mean of its divisors is an integer number (103152).

2⁹⁹⁷⁶²⁸ is an apocalyptic number.

It is an amenable number.

997628 is a deficient number, since it is larger than the sum of its proper divisors (859108).

997628 is a wasteful number, since it uses less digits than its factorization.

997628 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 901 (or 882 counting only the distinct ones).

The product of its digits is 54432, while the sum is 41.

The square root of 997628 is about 998.8132958666. The cubic root of 997628 is about 99.9208707354.

The spelling of 997628 in words is "nine hundred ninety-seven thousand, six hundred twenty-eight".