1645822080 has 192 divisors, whose sum is σ = 6495278400. Its totient is φ = 376178688.

The previous prime is 1645822027. The next prime is 1645822081. The reversal of 1645822080 is 802285461.

1645822080 is a `hidden beast` number, since 1 + 645 + 8 + 2 + 2 + 0 + 8 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (192).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (1645822081) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 19911 + ... + 60729.

It is an arithmetic number, because the mean of its divisors is an integer number (33829575).

Almost surely, 2^1645822080 is an apocalyptic number.

1645822080 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 1645822080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3247639200).

1645822080 is an abundant number, since it is smaller than the sum of its proper divisors (4849456320).

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

1645822080 is a wasteful number, since it uses less digits than its factorization.

1645822080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40851 (or 40836 counting only the distinct ones).

The product of its (nonzero) digits is 30720, while the sum is 36.

The square root of 1645822080 is about 40568.7327877024. The cubic root of 1645822080 is about 1180.6675529501.

The spelling of 1645822080 in words is "one billion, six hundred forty-five million, eight hundred twenty-two thousand, eighty".