1645484544 has 200 divisors, whose sum is σ = 5359308768. Its totient is φ = 498493440.

The previous prime is 1645484543. The next prime is 1645484573. The reversal of 1645484544 is 4454845461.

1645484544 is a `hidden beast` number, since 1 + 64 + 5 + 48 + 4 + 544 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 1645484544.

It is not an unprimeable number, because it can be changed into a prime (1645484543) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 454389 + ... + 457995.

Almost surely, 2^1645484544 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 1645484544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2679654384).

1645484544 is an abundant number, since it is smaller than the sum of its proper divisors (3713824224).

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

1645484544 is an equidigital number, since it uses as much as digits as its factorization.

1645484544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3648 (or 3623 counting only the distinct ones).

The product of its digits is 1228800, while the sum is 45.

The square root of 1645484544 is about 40564.5725233238. The cubic root of 1645484544 is about 1180.5868344134.

The spelling of 1645484544 in words is "one billion, six hundred forty-five million, four hundred eighty-four thousand, five hundred forty-four".