1645669472 has 24 divisors (see below), whose sum is σ = 3344427072. Its totient is φ = 796291200.

The previous prime is 1645669433. The next prime is 1645669483. The reversal of 1645669472 is 2749665461.

It is a super-2 number, since 2×1645669472² = 5416456022145517568, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1645669472.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 828479 + ... + 830462.

It is an arithmetic number, because the mean of its divisors is an integer number (139351128).

Almost surely, 2^1645669472 is an apocalyptic number.

It is an amenable number.

1645669472 is an abundant number, since it is smaller than the sum of its proper divisors (1698757600).

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

1645669472 is a wasteful number, since it uses less digits than its factorization.

1645669472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1658982 (or 1658974 counting only the distinct ones).

The product of its digits is 2177280, while the sum is 50.

The square root of 1645669472 is about 40566.8518867314. The cubic root of 1645669472 is about 1180.6310595597.

The spelling of 1645669472 in words is "one billion, six hundred forty-five million, six hundred sixty-nine thousand, four hundred seventy-two".