1645452620 has 96 divisors (see below), whose sum is σ = 4056611328. Its totient is φ = 548900352.

The previous prime is 1645452607. The next prime is 1645452629. The reversal of 1645452620 is 262545461.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is not an unprimeable number, because it can be changed into a prime (1645452629) 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, 2666552 + ... + 2667168.

It is an arithmetic number, because the mean of its divisors is an integer number (42256368).

Almost surely, 2^1645452620 is an apocalyptic number.

1645452620 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1645452620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2028305664).

1645452620 is an abundant number, since it is smaller than the sum of its proper divisors (2411158708).

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

1645452620 is a wasteful number, since it uses less digits than its factorization.

1645452620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1119 (or 1117 counting only the distinct ones).

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

The square root of 1645452620 is about 40564.1790253421. The cubic root of 1645452620 is about 1180.5791995199.

The spelling of 1645452620 in words is "one billion, six hundred forty-five million, four hundred fifty-two thousand, six hundred twenty".