4638644 has 6 divisors (see below), whose sum is σ = 8117634. Its totient is φ = 2319320.

The previous prime is 4638631. The next prime is 4638659. The reversal of 4638644 is 4468364.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 4571044 + 67600 = 2138^2 + 260^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 579827 + ... + 579834.

It is an arithmetic number, because the mean of its divisors is an integer number (1352939).

Almost surely, 2^4638644 is an apocalyptic number.

It is an amenable number.

4638644 is a deficient number, since it is larger than the sum of its proper divisors (3478990).

4638644 is a wasteful number, since it uses less digits than its factorization.

4638644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1159665 (or 1159663 counting only the distinct ones).

The product of its digits is 55296, while the sum is 35.

The square root of 4638644 is about 2153.7511462562. The cubic root of 4638644 is about 166.7747689793.

The spelling of 4638644 in words is "four million, six hundred thirty-eight thousand, six hundred forty-four".