1645413280 has 96 divisors (see below), whose sum is σ = 4470367104. Its totient is φ = 560618496.

The previous prime is 1645413277. The next prime is 1645413409. The reversal of 1645413280 is 823145461.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 178054 + ... + 187066.

It is an arithmetic number, because the mean of its divisors is an integer number (46566324).

Almost surely, 2^1645413280 is an apocalyptic number.

1645413280 is a gapful number since it is divisible by the number (10) 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 1645413280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2235183552).

1645413280 is an abundant number, since it is smaller than the sum of its proper divisors (2824953824).

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

1645413280 is a wasteful number, since it uses less digits than its factorization.

1645413280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9198 (or 9190 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 34.

The square root of 1645413280 is about 40563.6941118533. The cubic root of 1645413280 is about 1180.5697908917.

The spelling of 1645413280 in words is "one billion, six hundred forty-five million, four hundred thirteen thousand, two hundred eighty".