1645726652 has 24 divisors (see below), whose sum is σ = 2902664352. Its totient is φ = 816408000.

The previous prime is 1645726637. The next prime is 1645726681. The reversal of 1645726652 is 2566275461.

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 833138 + ... + 835110.

It is an arithmetic number, because the mean of its divisors is an integer number (120944348).

Almost surely, 2^1645726652 is an apocalyptic number.

It is an amenable number.

1645726652 is a deficient number, since it is larger than the sum of its proper divisors (1256937700).

1645726652 is a wasteful number, since it uses less digits than its factorization.

1645726652 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3509 (or 3507 counting only the distinct ones).

The product of its digits is 604800, while the sum is 44.

The square root of 1645726652 is about 40567.5566432094. The cubic root of 1645726652 is about 1180.6447333671.

The spelling of 1645726652 in words is "one billion, six hundred forty-five million, seven hundred twenty-six thousand, six hundred fifty-two".