421564528 has 40 divisors (see below), whose sum is σ = 1018327680. Its totient is φ = 164245440.

The previous prime is 421564439. The next prime is 421564529. The reversal of 421564528 is 825465124.

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421564529) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 169858 + ... + 172321.

It is an arithmetic number, because the mean of its divisors is an integer number (25458192).

Almost surely, 2^421564528 is an apocalyptic number.

It is an amenable number.

421564528 is an abundant number, since it is smaller than the sum of its proper divisors (596763152).

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

421564528 is a wasteful number, since it uses less digits than its factorization.

421564528 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 342205 (or 342199 counting only the distinct ones).

The product of its digits is 76800, while the sum is 37.

The square root of 421564528 is about 20532.0366257223. The cubic root of 421564528 is about 749.8159714409.

The spelling of 421564528 in words is "four hundred twenty-one million, five hundred sixty-four thousand, five hundred twenty-eight".