7216638 has 48 divisors (see below), whose sum is σ = 17076096. Its totient is φ = 2015520.

The previous prime is 7216633. The next prime is 7216661. The reversal of 7216638 is 8366127.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a junction number, because it is equal to n+sod(n) for n = 7216599 and 7216608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7216631) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10831 + ... + 11477.

It is an arithmetic number, because the mean of its divisors is an integer number (355752).

Almost surely, 2^7216638 is an apocalyptic number.

7216638 is a gapful number since it is divisible by the number (78) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 7216638, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8538048).

7216638 is an abundant number, since it is smaller than the sum of its proper divisors (9859458).

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

7216638 is a wasteful number, since it uses less digits than its factorization.

7216638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 689 (or 676 counting only the distinct ones).

The product of its digits is 12096, while the sum is 33.

The square root of 7216638 is about 2686.3800922431. The cubic root of 7216638 is about 193.2465015012.

The spelling of 7216638 in words is "seven million, two hundred sixteen thousand, six hundred thirty-eight".