1645969704 has 128 divisors (see below), whose sum is σ = 4418150400. Its totient is φ = 510048000.

The previous prime is 1645969687. The next prime is 1645969709. The reversal of 1645969704 is 4079695461.

It is not an unprimeable number, because it can be changed into a prime (1645969709) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2191329 + ... + 2192079.

It is an arithmetic number, because the mean of its divisors is an integer number (34516800).

Almost surely, 2^1645969704 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1645969704, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2209075200).

1645969704 is an abundant number, since it is smaller than the sum of its proper divisors (2772180696).

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

1645969704 is a wasteful number, since it uses less digits than its factorization.

1645969704 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 903 (or 899 counting only the distinct ones).

The product of its (nonzero) digits is 1632960, while the sum is 51.

The square root of 1645969704 is about 40570.5521776571. The cubic root of 1645969704 is about 1180.7028523623.

The spelling of 1645969704 in words is "one billion, six hundred forty-five million, nine hundred sixty-nine thousand, seven hundred four".