645422084 has 12 divisors (see below), whose sum is σ = 1129666524. Its totient is φ = 322660224.

The previous prime is 645422081. The next prime is 645422093. The reversal of 645422084 is 480224546.

It can be written as a sum of positive squares in 2 ways, for example, as 283585600 + 361836484 = 16840^2 + 19022^2 .

It is not an unprimeable number, because it can be changed into a prime (645422081) 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, 43352 + ... + 56304.

It is an arithmetic number, because the mean of its divisors is an integer number (94138877).

Almost surely, 2^645422084 is an apocalyptic number.

It is an amenable number.

645422084 is a deficient number, since it is larger than the sum of its proper divisors (484244440).

645422084 is a wasteful number, since it uses less digits than its factorization.

645422084 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25414 (or 25412 counting only the distinct ones).

The product of its (nonzero) digits is 61440, while the sum is 35.

The square root of 645422084 is about 25405.1586100146. The cubic root of 645422084 is about 864.2006867635.

The spelling of 645422084 in words is "six hundred forty-five million, four hundred twenty-two thousand, eighty-four".