1645528206 has 64 divisors (see below), whose sum is σ = 3869918208. Its totient is φ = 456738048.

The previous prime is 1645528127. The next prime is 1645528207. The reversal of 1645528206 is 6028255461.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1645528207) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 225690 + ... + 232866.

It is an arithmetic number, because the mean of its divisors is an integer number (60467472).

Almost surely, 2^1645528206 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1645528206, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1934959104).

1645528206 is an abundant number, since it is smaller than the sum of its proper divisors (2224390002).

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

1645528206 is a wasteful number, since it uses less digits than its factorization.

1645528206 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7345.

The product of its (nonzero) digits is 115200, while the sum is 39.

The square root of 1645528206 is about 40565.1106987273. The cubic root of 1645528206 is about 1180.5972763886.

The spelling of 1645528206 in words is "one billion, six hundred forty-five million, five hundred twenty-eight thousand, two hundred six".