421701680 has 80 divisors (see below), whose sum is σ = 1023101184. Its totient is φ = 161464320.

The previous prime is 421701661. The next prime is 421701689. The reversal of 421701680 is 86107124.

It is a tau number, because it is divible by the number of its divisors (80).

It is not an unprimeable number, because it can be changed into a prime (421701689) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 239684 + ... + 241436.

Almost surely, 2^421701680 is an apocalyptic number.

421701680 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 421701680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (511550592).

421701680 is an abundant number, since it is smaller than the sum of its proper divisors (601399504).

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

421701680 is a wasteful number, since it uses less digits than its factorization.

421701680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1894 (or 1888 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 29.

The square root of 421701680 is about 20535.3763052933. The cubic root of 421701680 is about 749.8972777834.

The spelling of 421701680 in words is "four hundred twenty-one million, seven hundred one thousand, six hundred eighty".