7220144 has 20 divisors (see below), whose sum is σ = 14072760. Its totient is φ = 3588480.

The previous prime is 7220131. The next prime is 7220149. The reversal of 7220144 is 4410227.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7220149) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1604 + ... + 4124.

It is an arithmetic number, because the mean of its divisors is an integer number (703638).

Almost surely, 2^7220144 is an apocalyptic number.

It is an amenable number.

7220144 is a deficient number, since it is larger than the sum of its proper divisors (6852616).

7220144 is a wasteful number, since it uses less digits than its factorization.

7220144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2708 (or 2702 counting only the distinct ones).

The product of its (nonzero) digits is 448, while the sum is 20.

The square root of 7220144 is about 2687.0325640007. The cubic root of 7220144 is about 193.2777908885.

The spelling of 7220144 in words is "seven million, two hundred twenty thousand, one hundred forty-four".