421735644 has 36 divisors (see below), whose sum is σ = 1162969080. Its totient is φ = 127798560.

The previous prime is 421735627. The next prime is 421735649. The reversal of 421735644 is 446537124.

421735644 is a `hidden beast` number, since 4 + 2 + 1 + 7 + 3 + 5 + 644 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 421735599 and 421735608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421735649) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 532099 + ... + 532890.

Almost surely, 2^421735644 is an apocalyptic number.

421735644 is a gapful number since it is divisible by the number (44) formed by its first and last digit.

It is an amenable number.

421735644 is an abundant number, since it is smaller than the sum of its proper divisors (741233436).

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

421735644 is a wasteful number, since it uses less digits than its factorization.

421735644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1065010 (or 1065005 counting only the distinct ones).

The product of its digits is 80640, while the sum is 36.

The square root of 421735644 is about 20536.2032518185. The cubic root of 421735644 is about 749.9174095721.

The spelling of 421735644 in words is "four hundred twenty-one million, seven hundred thirty-five thousand, six hundred forty-four".