420890720 has 48 divisors (see below), whose sum is σ = 1026442368. Its totient is φ = 162923520.

The previous prime is 420890713. The next prime is 420890737. The reversal of 420890720 is 27098024.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37469 + ... + 47388.

It is an arithmetic number, because the mean of its divisors is an integer number (21384216).

Almost surely, 2^420890720 is an apocalyptic number.

420890720 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

420890720 is an abundant number, since it is smaller than the sum of its proper divisors (605551648).

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

420890720 is a wasteful number, since it uses less digits than its factorization.

420890720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84903 (or 84895 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 32.

The square root of 420890720 is about 20515.6213651939. The cubic root of 420890720 is about 749.4162687579.

The spelling of 420890720 in words is "four hundred twenty million, eight hundred ninety thousand, seven hundred twenty".