1623805625 has 20 divisors (see below), whose sum is σ = 2185203636. Its totient is φ = 1199112000.

The previous prime is 1623805621. The next prime is 1623805633. The reversal of 1623805625 is 5265083261.

It can be written as a sum of positive squares in 10 ways, for example, as 1182259456 + 441546169 = 34384^2 + 21013^2 .

It is not a de Polignac number, because 1623805625 - 2² = 1623805621 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1623805621) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 91802 + ... + 108051.

Almost surely, 2^1623805625 is an apocalyptic number.

It is an amenable number.

1623805625 is a deficient number, since it is larger than the sum of its proper divisors (561398011).

1623805625 is an equidigital number, since it uses as much as digits as its factorization.

1623805625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 199886 (or 199871 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 38.

The square root of 1623805625 is about 40296.4716197337. The cubic root of 1623805625 is about 1175.3792347629.

Adding to 1623805625 its reverse (5265083261), we get a palindrome (6888888886).

The spelling of 1623805625 in words is "one billion, six hundred twenty-three million, eight hundred five thousand, six hundred twenty-five".