4990644 has 18 divisors (see below), whose sum is σ = 12615330. Its totient is φ = 1663536.

The previous prime is 4990637. The next prime is 4990649. The reversal of 4990644 is 4460994.

4990644 is a `hidden beast` number, since 4 + 9 + 9 + 0 + 644 = 666.

It can be written as a sum of positive squares in only one way, i.e., 4410000 + 580644 = 2100^2 + 762^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 138629 = 4990644 / (4 + 9 + 9 + 0 + 6 + 4 + 4).

It is a junction number, because it is equal to n+sod(n) for n = 4990599 and 4990608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4990649) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 69279 + ... + 69350.

Almost surely, 2^4990644 is an apocalyptic number.

It is an amenable number.

4990644 is an abundant number, since it is smaller than the sum of its proper divisors (7624686).

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

4990644 is a wasteful number, since it uses less digits than its factorization.

4990644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138639 (or 138634 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 36.

The square root of 4990644 is about 2233.9749327152. The cubic root of 4990644 is about 170.8908711732.

The spelling of 4990644 in words is "four million, nine hundred ninety thousand, six hundred forty-four".