7213644 has 48 divisors (see below), whose sum is σ = 19807200. Its totient is φ = 2262528.

The previous prime is 7213639. The next prime is 7213667. The reversal of 7213644 is 4463127.

7213644 is a `hidden beast` number, since 7 + 2 + 13 + 644 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 129 + ... + 3800.

It is an arithmetic number, because the mean of its divisors is an integer number (412650).

Almost surely, 2^7213644 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 7213644, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9903600).

7213644 is an abundant number, since it is smaller than the sum of its proper divisors (12593556).

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

7213644 is a wasteful number, since it uses less digits than its factorization.

7213644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3959 (or 3951 counting only the distinct ones).

The product of its digits is 4032, while the sum is 27.

The square root of 7213644 is about 2685.8227789636. The cubic root of 7213644 is about 193.2197734478.

The spelling of 7213644 in words is "seven million, two hundred thirteen thousand, six hundred forty-four".