1045621620 has 72 divisors (see below), whose sum is σ = 3187766400. Its totient is φ = 277421760.

The previous prime is 1045621613. The next prime is 1045621627. The reversal of 1045621620 is 261265401.

1045621620 is a `hidden beast` number, since 10 + 4 + 5 + 6 + 21 + 620 = 666.

It is an interprime number because it is at equal distance from previous prime (1045621613) and next prime (1045621627).

It is a super-2 number, since 2×1045621620² = 2186649144422848800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1045621627) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 21225 + ... + 50415.

Almost surely, 2^1045621620 is an apocalyptic number.

1045621620 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 1045621620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1593883200).

1045621620 is an abundant number, since it is smaller than the sum of its proper divisors (2142144780).

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

1045621620 is a wasteful number, since it uses less digits than its factorization.

1045621620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29405 (or 29400 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 1045621620 is about 32336.0730454395. The cubic root of 1045621620 is about 1014.9816363652.

The spelling of 1045621620 in words is "one billion, forty-five million, six hundred twenty-one thousand, six hundred twenty".