420428409720 has 128 divisors (see below), whose sum is σ = 1384712202240. Its totient is φ = 101272803840.

The previous prime is 420428409719. The next prime is 420428409727. The reversal of 420428409720 is 27904824024.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (420428409727) 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, 807112 + ... + 1221591.

It is an arithmetic number, because the mean of its divisors is an integer number (10818064080).

Almost surely, 2^420428409720 is an apocalyptic number.

420428409720 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

420428409720 is an abundant number, since it is smaller than the sum of its proper divisors (964283792520).

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

420428409720 is a wasteful number, since it uses less digits than its factorization.

420428409720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2028885 (or 2028881 counting only the distinct ones).

The product of its (nonzero) digits is 258048, while the sum is 42.

The spelling of 420428409720 in words is "four hundred twenty billion, four hundred twenty-eight million, four hundred nine thousand, seven hundred twenty".