1645512736 has 96 divisors (see below), whose sum is σ = 3988389888. Its totient is φ = 652734720.

The previous prime is 1645512731. The next prime is 1645512749. The reversal of 1645512736 is 6372155461.

It is not an unprimeable number, because it can be changed into a prime (1645512731) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 154561 + ... + 164863.

It is an arithmetic number, because the mean of its divisors is an integer number (41545728).

Almost surely, 2^1645512736 is an apocalyptic number.

1645512736 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 1645512736, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1994194944).

1645512736 is an abundant number, since it is smaller than the sum of its proper divisors (2342877152).

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

1645512736 is a wasteful number, since it uses less digits than its factorization.

1645512736 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10374 (or 10366 counting only the distinct ones).

The product of its digits is 151200, while the sum is 40.

The square root of 1645512736 is about 40564.9200171774. The cubic root of 1645512736 is about 1180.5935766856.

The spelling of 1645512736 in words is "one billion, six hundred forty-five million, five hundred twelve thousand, seven hundred thirty-six".