1645730744 has 64 divisors (see below), whose sum is σ = 3733171200. Its totient is φ = 665126784.

The previous prime is 1645730741. The next prime is 1645730783. The reversal of 1645730744 is 4470375461.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1645730741) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 58049 + ... + 81615.

It is an arithmetic number, because the mean of its divisors is an integer number (58330800).

Almost surely, 2^1645730744 is an apocalyptic number.

1645730744 is a gapful number since it is divisible by the number (14) 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 1645730744, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1866585600).

1645730744 is an abundant number, since it is smaller than the sum of its proper divisors (2087440456).

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

1645730744 is a wasteful number, since it uses less digits than its factorization.

1645730744 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23652 (or 23648 counting only the distinct ones).

The product of its (nonzero) digits is 282240, while the sum is 41.

The square root of 1645730744 is about 40567.6070775687. The cubic root of 1645730744 is about 1180.6457119002.

The spelling of 1645730744 in words is "one billion, six hundred forty-five million, seven hundred thirty thousand, seven hundred forty-four".