1645204896 has 72 divisors (see below), whose sum is σ = 4714373664. Its totient is φ = 544202880.

The previous prime is 1645204843. The next prime is 1645204919. The reversal of 1645204896 is 6984025461.

1645204896 is a `hidden beast` number, since 164 + 5 + 2 + 0 + 489 + 6 = 666.

It is a tau number, because it is divible by the number of its divisors (72).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15925 + ... + 59531.

It is an arithmetic number, because the mean of its divisors is an integer number (65477412).

Almost surely, 2^1645204896 is an apocalyptic number.

1645204896 is a gapful number since it is divisible by the number (16) 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 1645204896, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2357186832).

1645204896 is an abundant number, since it is smaller than the sum of its proper divisors (3069168768).

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

1645204896 is a wasteful number, since it uses less digits than its factorization.

1645204896 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43754 (or 43743 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 45.

The square root of 1645204896 is about 40561.1254281732. The cubic root of 1645204896 is about 1180.5199508820.

The spelling of 1645204896 in words is "one billion, six hundred forty-five million, two hundred four thousand, eight hundred ninety-six".