645949548 has 18 divisors (see below), whose sum is σ = 1632817004. Its totient is φ = 215316504.

The previous prime is 645949537. The next prime is 645949553. The reversal of 645949548 is 845949546.

645949548 is a `hidden beast` number, since 6 + 4 + 5 + 94 + 9 + 548 = 666.

It is a tau number, because it is divible by the number of its divisors (18).

It is a super-2 number, since 2×645949548² = 834501637122808608, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 645949494 and 645949503.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8971486 + ... + 8971557.

Almost surely, 2^645949548 is an apocalyptic number.

It is an amenable number.

645949548 is an abundant number, since it is smaller than the sum of its proper divisors (986867456).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

645949548 is a wasteful number, since it uses less digits than its factorization.

645949548 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17943053 (or 17943048 counting only the distinct ones).

The product of its digits is 6220800, while the sum is 54.

The square root of 645949548 is about 25415.5375312032. The cubic root of 645949548 is about 864.4360421190.

The spelling of 645949548 in words is "six hundred forty-five million, nine hundred forty-nine thousand, five hundred forty-eight".