1642545620 has 24 divisors (see below), whose sum is σ = 3484910184. Its totient is φ = 650244096.

The previous prime is 1642545617. The next prime is 1642545623. The reversal of 1642545620 is 265452461.

It is an interprime number because it is at equal distance from previous prime (1642545617) and next prime (1642545623).

It can be written as a sum of positive squares in 4 ways, for example, as 98684356 + 1543861264 = 9934^2 + 39292^2 .

It is a super-2 number, since 2×1642545620² = 5395912227562368800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1642545623) 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, 421397 + ... + 425276.

It is an arithmetic number, because the mean of its divisors is an integer number (145204591).

Almost surely, 2^1642545620 is an apocalyptic number.

1642545620 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1642545620 is an abundant number, since it is smaller than the sum of its proper divisors (1842364564).

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

1642545620 is a wasteful number, since it uses less digits than its factorization.

1642545620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 846779 (or 846777 counting only the distinct ones).

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

The square root of 1642545620 is about 40528.3310783950. The cubic root of 1642545620 is about 1179.8835516610.

The spelling of 1642545620 in words is "one billion, six hundred forty-two million, five hundred forty-five thousand, six hundred twenty".