423706644 has 36 divisors (see below), whose sum is σ = 1117605216. Its totient is φ = 135094608.

The previous prime is 423706639. The next prime is 423706663. The reversal of 423706644 is 446607324.

423706644 is a `hidden beast` number, since 4 + 2 + 3 + 7 + 0 + 6 + 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 = 423706599 and 423706608.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 255034 + ... + 256689.

Almost surely, 2^423706644 is an apocalyptic number.

It is an amenable number.

423706644 is an abundant number, since it is smaller than the sum of its proper divisors (693898572).

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

423706644 is a wasteful number, since it uses less digits than its factorization.

423706644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 511756 (or 511751 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 36.

The square root of 423706644 is about 20584.1357360468. The cubic root of 423706644 is about 751.0838515998.

The spelling of 423706644 in words is "four hundred twenty-three million, seven hundred six thousand, six hundred forty-four".