421878581840 has 40 divisors (see below), whose sum is σ = 992685401568. Its totient is φ = 166718280320.

The previous prime is 421878581753. The next prime is 421878581849. The reversal of 421878581840 is 48185878124.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421878581849) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31761326 + ... + 31774605.

Almost surely, 2^421878581840 is an apocalyptic number.

421878581840 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

421878581840 is an abundant number, since it is smaller than the sum of its proper divisors (570806819728).

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

421878581840 is a wasteful number, since it uses less digits than its factorization.

421878581840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63536027 (or 63536021 counting only the distinct ones).

The product of its (nonzero) digits is 4587520, while the sum is 56.

The spelling of 421878581840 in words is "four hundred twenty-one billion, eight hundred seventy-eight million, five hundred eighty-one thousand, eight hundred forty".