9780645 has 32 divisors (see below), whose sum is σ = 18259200. Its totient is φ = 4468800.

The previous prime is 9780601. The next prime is 9780647. The reversal of 9780645 is 5460879.

It is not a de Polignac number, because 9780645 - 2⁶ = 9780581 is a prime.

It is a super-2 number, since 2×9780645² = 191322033232050, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9780647) 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 31 ways as a sum of consecutive naturals, for example, 4195 + ... + 6095.

It is an arithmetic number, because the mean of its divisors is an integer number (570600).

Almost surely, 2^9780645 is an apocalyptic number.

It is an amenable number.

9780645 is a deficient number, since it is larger than the sum of its proper divisors (8478555).

9780645 is a wasteful number, since it uses less digits than its factorization.

9780645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1930 (or 1916 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 39.

The square root of 9780645 is about 3127.4022766507. The cubic root of 9780645 is about 213.8565215791.

The spelling of 9780645 in words is "nine million, seven hundred eighty thousand, six hundred forty-five".