1645620204 has 24 divisors (see below), whose sum is σ = 3848015808. Its totient is φ = 547363600.

The previous prime is 1645620203. The next prime is 1645620217. The reversal of 1645620204 is 4020265461.

It is not an unprimeable number, because it can be changed into a prime (1645620203) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 141222 + ... + 152429.

It is an arithmetic number, because the mean of its divisors is an integer number (160333992).

Almost surely, 2^1645620204 is an apocalyptic number.

It is an amenable number.

1645620204 is an abundant number, since it is smaller than the sum of its proper divisors (2202395604).

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

1645620204 is a wasteful number, since it uses less digits than its factorization.

1645620204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 294125 (or 294123 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 30.

The square root of 1645620204 is about 40566.2446376294. The cubic root of 1645620204 is about 1180.6192775438.

Adding to 1645620204 its reverse (4020265461), we get a palindrome (5665885665).

The spelling of 1645620204 in words is "one billion, six hundred forty-five million, six hundred twenty thousand, two hundred four".