421560720 has 320 divisors, whose sum is σ = 1696320000. Its totient is φ = 96187392.

The previous prime is 421560707. The next prime is 421560731. The reversal of 421560720 is 27065124.

421560720 is a `hidden beast` number, since 42 + 15 + 607 + 2 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 740596 + ... + 741164.

It is an arithmetic number, because the mean of its divisors is an integer number (5301000).

Almost surely, 2^421560720 is an apocalyptic number.

421560720 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 421560720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (848160000).

421560720 is an abundant number, since it is smaller than the sum of its proper divisors (1274759280).

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

421560720 is a wasteful number, since it uses less digits than its factorization.

421560720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 612 (or 586 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 27.

The square root of 421560720 is about 20531.9438923839. The cubic root of 421560720 is about 749.8137137337.

The spelling of 421560720 in words is "four hundred twenty-one million, five hundred sixty thousand, seven hundred twenty".