1645204652 has 48 divisors (see below), whose sum is σ = 3556261632. Its totient is φ = 648509760.

The previous prime is 1645204621. The next prime is 1645204657. The reversal of 1645204652 is 2564025461.

It is a super-2 number, since 2×1645204652² = 5413396693924882208, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1645204657) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 95027 + ... + 110997.

It is an arithmetic number, because the mean of its divisors is an integer number (74088784).

Almost surely, 2^1645204652 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1645204652, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1778130816).

1645204652 is an abundant number, since it is smaller than the sum of its proper divisors (1911056980).

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

1645204652 is a wasteful number, since it uses less digits than its factorization.

1645204652 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16278 (or 16276 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 35.

The square root of 1645204652 is about 40561.1224203670. The cubic root of 1645204652 is about 1180.5198925211.

The spelling of 1645204652 in words is "one billion, six hundred forty-five million, two hundred four thousand, six hundred fifty-two".