421664172 has 48 divisors (see below), whose sum is σ = 1022160384. Its totient is φ = 135184000.

The previous prime is 421664171. The next prime is 421664183. The reversal of 421664172 is 271466124.

It is not an unprimeable number, because it can be changed into a prime (421664171) 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, 28897 + ... + 40967.

It is an arithmetic number, because the mean of its divisors is an integer number (21295008).

Almost surely, 2^421664172 is an apocalyptic number.

It is an amenable number.

421664172 is an abundant number, since it is smaller than the sum of its proper divisors (600496212).

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

421664172 is a wasteful number, since it uses less digits than its factorization.

421664172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12190 (or 12188 counting only the distinct ones).

The product of its digits is 16128, while the sum is 33.

The square root of 421664172 is about 20534.4630316938. The cubic root of 421664172 is about 749.8750440714.

The spelling of 421664172 in words is "four hundred twenty-one million, six hundred sixty-four thousand, one hundred seventy-two".