1645354520 has 32 divisors (see below), whose sum is σ = 3919816800. Its totient is φ = 619427328.

The previous prime is 1645354511. The next prime is 1645354523. The reversal of 1645354520 is 254535461.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1645354523) 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 7 ways as a sum of consecutive naturals, for example, 1209140 + ... + 1210499.

It is an arithmetic number, because the mean of its divisors is an integer number (122494275).

Almost surely, 2^1645354520 is an apocalyptic number.

1645354520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1645354520 is an abundant number, since it is smaller than the sum of its proper divisors (2274462280).

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

1645354520 is a wasteful number, since it uses less digits than its factorization.

1645354520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2419667 (or 2419663 counting only the distinct ones).

The product of its (nonzero) digits is 72000, while the sum is 35.

The square root of 1645354520 is about 40562.9698123794. The cubic root of 1645354520 is about 1180.5557374605. Note that the first 3 decimals are identical.

Adding to 1645354520 its reverse (254535461), we get a palindrome (1899889981).

The spelling of 1645354520 in words is "one billion, six hundred forty-five million, three hundred fifty-four thousand, five hundred twenty".