7221690 has 64 divisors (see below), whose sum is σ = 22014720. Its totient is φ = 1650240.

The previous prime is 7221689. The next prime is 7221707. The reversal of 7221690 is 961227.

It is a super-2 number, since 2×7221690² = 104305612912200, which contains 22 as substring.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 21 + ... + 3800.

It is an arithmetic number, because the mean of its divisors is an integer number (343980).

Almost surely, 2^7221690 is an apocalyptic number.

7221690 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 7221690, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11007360).

7221690 is an abundant number, since it is smaller than the sum of its proper divisors (14793030).

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

7221690 is a wasteful number, since it uses less digits than its factorization.

7221690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3844 (or 3838 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 27.

The square root of 7221690 is about 2687.3202265454. The cubic root of 7221690 is about 193.2915849874.

The spelling of 7221690 in words is "seven million, two hundred twenty-one thousand, six hundred ninety".