645773152 has 96 divisors (see below), whose sum is σ = 1404345600. Its totient is φ = 290979840.

The previous prime is 645773143. The next prime is 645773171. The reversal of 645773152 is 251377546.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2512608 + ... + 2512864.

It is an arithmetic number, because the mean of its divisors is an integer number (14628600).

Almost surely, 2^645773152 is an apocalyptic number.

645773152 is a gapful number since it is divisible by the number (62) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 645773152, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (702172800).

645773152 is an abundant number, since it is smaller than the sum of its proper divisors (758572448).

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

645773152 is a wasteful number, since it uses less digits than its factorization.

645773152 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 464 (or 456 counting only the distinct ones).

The product of its digits is 176400, while the sum is 40.

The square root of 645773152 is about 25412.0670548462. The cubic root of 645773152 is about 864.3573481804.

The spelling of 645773152 in words is "six hundred forty-five million, seven hundred seventy-three thousand, one hundred fifty-two".