7220000 has 90 divisors (see below), whose sum is σ = 18746343. Its totient is φ = 2736000.

The previous prime is 7219997. The next prime is 7220027. The reversal of 7220000 is 227.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in 3 ways, for example, as 1669264 + 5550736 = 1292^2 + 2356^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=1900.

It is a Duffinian number.

It is a nialpdrome in base 10.

It is an unprimeable number.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 379991 + ... + 380009.

Almost surely, 2^7220000 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 7220000

7220000 is an abundant number, since it is smaller than the sum of its proper divisors (11526343).

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

7220000 is an equidigital number, since it uses as much as digits as its factorization.

7220000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68 (or 26 counting only the distinct ones).

The product of its (nonzero) digits is 28, while the sum is 11.

The square root of 7220000 is about 2687.0057685089. The cubic root of 7220000 is about 193.2765059563.

Adding to 7220000 its reverse (227), we get a palindrome (7220227).

It can be divided in two parts, 72 and 20000, that multiplied together give a square (1440000 = 1200²).

The spelling of 7220000 in words is "seven million, two hundred twenty thousand".