1645897260 has 144 divisors (see below), whose sum is σ = 5534161920. Its totient is φ = 364049280.

The previous prime is 1645897259. The next prime is 1645897327. The reversal of 1645897260 is 627985461.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 82111 + ... + 100169.

It is an arithmetic number, because the mean of its divisors is an integer number (38431680).

Almost surely, 2^1645897260 is an apocalyptic number.

1645897260 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 1645897260, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2767080960).

1645897260 is an abundant number, since it is smaller than the sum of its proper divisors (3888264660).

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

1645897260 is a wasteful number, since it uses less digits than its factorization.

1645897260 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18116 (or 18107 counting only the distinct ones).

The product of its (nonzero) digits is 725760, while the sum is 48.

The square root of 1645897260 is about 40569.6593527725. The cubic root of 1645897260 is about 1180.6855300320.

The spelling of 1645897260 in words is "one billion, six hundred forty-five million, eight hundred ninety-seven thousand, two hundred sixty".