645560454 has 128 divisors (see below), whose sum is σ = 1706987520. Its totient is φ = 157680000.

The previous prime is 645560453. The next prime is 645560467. The reversal of 645560454 is 454065546.

645560454 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×645560454² = 833496599537372232, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645560453) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2203132 + ... + 2203424.

It is an arithmetic number, because the mean of its divisors is an integer number (13335840).

Almost surely, 2^645560454 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 645560454, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (853493760).

645560454 is an abundant number, since it is smaller than the sum of its proper divisors (1061427066).

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

645560454 is a wasteful number, since it uses less digits than its factorization.

645560454 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 586.

The product of its (nonzero) digits is 288000, while the sum is 39.

The square root of 645560454 is about 25407.8817298885. The cubic root of 645560454 is about 864.2624401017.

The spelling of 645560454 in words is "six hundred forty-five million, five hundred sixty thousand, four hundred fifty-four".