1645479552 has 128 divisors (see below), whose sum is σ = 4485274560. Its totient is φ = 534290432.

The previous prime is 1645479551. The next prime is 1645479569. The reversal of 1645479552 is 2559745461.

It is a tau number, because it is divible by the number of its divisors (128).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is not an unprimeable number, because it can be changed into a prime (1645479551) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4741843 + ... + 4742189.

Almost surely, 2^1645479552 is an apocalyptic number.

1645479552 is a gapful number since it is divisible by the number (12) 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 1645479552, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2242637280).

1645479552 is an abundant number, since it is smaller than the sum of its proper divisors (2839795008).

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

1645479552 is a wasteful number, since it uses less digits than its factorization.

1645479552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 650 (or 638 counting only the distinct ones).

The product of its digits is 1512000, while the sum is 48.

The square root of 1645479552 is about 40564.5109917524. The cubic root of 1645479552 is about 1180.5856405411.

The spelling of 1645479552 in words is "one billion, six hundred forty-five million, four hundred seventy-nine thousand, five hundred fifty-two".