1642780429020 has 144 divisors (see below), whose sum is σ = 5026796716032. Its totient is φ = 434247454080.

The previous prime is 1642780429009. The next prime is 1642780429061. The reversal of 1642780429020 is 209240872461.

1642780429020 is a `hidden beast` number, since 1 + 6 + 427 + 80 + 42 + 90 + 20 = 666.

It is a super-2 number, since 2×1642780429020² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 11164125 + ... + 11310315.

It is an arithmetic number, because the mean of its divisors is an integer number (34908310528).

Almost surely, 2^{1642780429020} is an apocalyptic number.

1642780429020 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 1642780429020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2513398358016).

1642780429020 is an abundant number, since it is smaller than the sum of its proper divisors (3384016287012).

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

1642780429020 is a wasteful number, since it uses less digits than its factorization.

1642780429020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146752 (or 146747 counting only the distinct ones).

The product of its (nonzero) digits is 387072, while the sum is 45.

The spelling of 1642780429020 in words is "one trillion, six hundred forty-two billion, seven hundred eighty million, four hundred twenty-nine thousand, twenty".