4891644 has 24 divisors (see below), whose sum is σ = 12682320. Its totient is φ = 1630512.

The previous prime is 4891643. The next prime is 4891661. The reversal of 4891644 is 4461984.

It is a happy number.

4891644 is a `hidden beast` number, since 4 + 8 + 9 + 1 + 644 = 666.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

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 = 4891599 and 4891608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4891643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22539 + ... + 22754.

It is an arithmetic number, because the mean of its divisors is an integer number (528430).

Almost surely, 2^4891644 is an apocalyptic number.

It is an amenable number.

4891644 is an abundant number, since it is smaller than the sum of its proper divisors (7790676).

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

4891644 is a wasteful number, since it uses less digits than its factorization.

4891644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45306 (or 45298 counting only the distinct ones).

The product of its digits is 27648, while the sum is 36.

The square root of 4891644 is about 2211.7061287612. The cubic root of 4891644 is about 169.7533215846.

The spelling of 4891644 in words is "four million, eight hundred ninety-one thousand, six hundred forty-four".