1645222620 has 24 divisors (see below), whose sum is σ = 4606623504. Its totient is φ = 438726016.

The previous prime is 1645222619. The next prime is 1645222697. The reversal of 1645222620 is 262225461.

It is a happy number.

1645222620 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is a super-3 number, since 3×1645222620³ (a number of 29 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13710129 + ... + 13710248.

It is an arithmetic number, because the mean of its divisors is an integer number (191942646).

Almost surely, 2^1645222620 is an apocalyptic number.

1645222620 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1645222620 is an abundant number, since it is smaller than the sum of its proper divisors (2961400884).

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

1645222620 is a wasteful number, since it uses less digits than its factorization.

1645222620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27420389 (or 27420387 counting only the distinct ones).

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

The square root of 1645222620 is about 40561.3439126467. The cubic root of 1645222620 is about 1180.5241901636.

The spelling of 1645222620 in words is "one billion, six hundred forty-five million, two hundred twenty-two thousand, six hundred twenty".