4387644 has 36 divisors (see below), whose sum is σ = 11155144. Its totient is φ = 1454112.

The previous prime is 4387633. The next prime is 4387661. The reversal of 4387644 is 4467834.

4387644 is a `hidden beast` number, since 4 + 3 + 8 + 7 + 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 = 4387599 and 4387608.

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, 10854 + ... + 11250.

Almost surely, 2^4387644 is an apocalyptic number.

It is an amenable number.

4387644 is an abundant number, since it is smaller than the sum of its proper divisors (6767500).

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

4387644 is a wasteful number, since it uses less digits than its factorization.

4387644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 714 (or 709 counting only the distinct ones).

The product of its digits is 64512, while the sum is 36.

The square root of 4387644 is about 2094.6703797973. The cubic root of 4387644 is about 163.7107234433.

The spelling of 4387644 in words is "four million, three hundred eighty-seven thousand, six hundred forty-four".