421662720 has 104 divisors (see below), whose sum is σ = 1349352576. Its totient is φ = 112427008.

The previous prime is 421662719. The next prime is 421662743. The reversal of 421662720 is 27266124.

It is a super-3 number, since 3×421662720³ (a number of 27 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

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, 58009 + ... + 64871.

It is an arithmetic number, because the mean of its divisors is an integer number (12974544).

Almost surely, 2^421662720 is an apocalyptic number.

421662720 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 421662720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (674676288).

421662720 is an abundant number, since it is smaller than the sum of its proper divisors (927689856).

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

421662720 is an equidigital number, since it uses as much as digits as its factorization.

421662720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6895 (or 6873 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 30.

The square root of 421662720 is about 20534.4276764657. The cubic root of 421662720 is about 749.8741833392.

The spelling of 421662720 in words is "four hundred twenty-one million, six hundred sixty-two thousand, seven hundred twenty".