4644640 has 192 divisors, whose sum is σ = 15240960. Its totient is φ = 1290240.

The previous prime is 4644631. The next prime is 4644667. The reversal of 4644640 is 464464.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a junction number, because it is equal to n+sod(n) for n = 4644599 and 4644608.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 160146 + ... + 160174.

It is an arithmetic number, because the mean of its divisors is an integer number (79380).

Almost surely, 2^4644640 is an apocalyptic number.

4644640 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 4644640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7620480).

4644640 is an abundant number, since it is smaller than the sum of its proper divisors (10596320).

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

4644640 is a wasteful number, since it uses less digits than its factorization.

4644640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75 (or 67 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 28.

The square root of 4644640 is about 2155.1426866915. The cubic root of 4644640 is about 166.8465967921.

The spelling of 4644640 in words is "four million, six hundred forty-four thousand, six hundred forty".