420663840 has 192 divisors, whose sum is σ = 1377129600. Its totient is φ = 107864064.

The previous prime is 420663829. The next prime is 420663847. The reversal of 420663840 is 48366024.

It is a super-3 number, since 3×420663840³ (a number of 27 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (420663847) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1836846 + ... + 1837074.

It is an arithmetic number, because the mean of its divisors is an integer number (7172550).

Almost surely, 2^420663840 is an apocalyptic number.

420663840 is a gapful number since it is divisible by the number (40) 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 420663840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (688564800).

420663840 is an abundant number, since it is smaller than the sum of its proper divisors (956465760).

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

420663840 is a wasteful number, since it uses less digits than its factorization.

420663840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 379 (or 371 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 33.

The square root of 420663840 is about 20510.0911748339. The cubic root of 420663840 is about 749.2815876201.

The spelling of 420663840 in words is "four hundred twenty million, six hundred sixty-three thousand, eight hundred forty".