645054160 has 20 divisors (see below), whose sum is σ = 1499751108. Its totient is φ = 258021632.

The previous prime is 645054143. The next prime is 645054167. The reversal of 645054160 is 61450546.

It can be written as a sum of positive squares in 2 ways, for example, as 224640144 + 420414016 = 14988^2 + 20504^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645054167) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4031509 + ... + 4031668.

Almost surely, 2^645054160 is an apocalyptic number.

It is an amenable number.

645054160 is an abundant number, since it is smaller than the sum of its proper divisors (854696948).

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

645054160 is a wasteful number, since it uses less digits than its factorization.

645054160 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8063190 (or 8063184 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 31.

The square root of 645054160 is about 25397.9164499768. The cubic root of 645054160 is about 864.0364425072.

The spelling of 645054160 in words is "six hundred forty-five million, fifty-four thousand, one hundred sixty".