645678096 has 120 divisors (see below), whose sum is σ = 1949410944. Its totient is φ = 183617280.

The previous prime is 645678091. The next prime is 645678097. The reversal of 645678096 is 690876546.

It is a zygodrome in base 7.

It is not an unprimeable number, because it can be changed into a prime (645678091) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 636886 + ... + 637898.

Almost surely, 2^645678096 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 645678096, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (974705472).

645678096 is an abundant number, since it is smaller than the sum of its proper divisors (1303732848).

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

645678096 is a wasteful number, since it uses less digits than its factorization.

645678096 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1309 (or 1296 counting only the distinct ones).

The product of its (nonzero) digits is 2177280, while the sum is 51.

The square root of 645678096 is about 25410.1966934536. The cubic root of 645678096 is about 864.3149357721.

The spelling of 645678096 in words is "six hundred forty-five million, six hundred seventy-eight thousand, ninety-six".