7220136 has 64 divisors (see below), whose sum is σ = 22510080. Its totient is φ = 1874880.

The previous prime is 7220131. The next prime is 7220149. The reversal of 7220136 is 6310227.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7220131) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 106 + ... + 3801.

It is an arithmetic number, because the mean of its divisors is an integer number (351720).

Almost surely, 2^7220136 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 7220136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11255040).

7220136 is an abundant number, since it is smaller than the sum of its proper divisors (15289944).

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

7220136 is a wasteful number, since it uses less digits than its factorization.

7220136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3934 (or 3930 counting only the distinct ones).

The product of its (nonzero) digits is 504, while the sum is 21.

The square root of 7220136 is about 2687.0310753692. The cubic root of 7220136 is about 193.2777195039.

Subtracting from 7220136 its reverse (6310227), we obtain a palindrome (909909).

The spelling of 7220136 in words is "seven million, two hundred twenty thousand, one hundred thirty-six".