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7288221 = 37134217
BaseRepresentation
bin11011110011010110011101
3111201021120010
4123303112131
53331210341
6420113433
7115643313
oct33632635
914637503
107288221
114128826
122535879
131682475
14d7a0b3
1598e716
hex6f359d

7288221 has 8 divisors (see below), whose sum is σ = 9854784. Its totient is φ = 4790240.

The previous prime is 7288213. The next prime is 7288231. The reversal of 7288221 is 1228827.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 7288221 - 23 = 7288213 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7288231) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16896 + ... + 17321.

It is an arithmetic number, because the mean of its divisors is an integer number (1231848).

Almost surely, 27288221 is an apocalyptic number.

7288221 is a gapful number since it is divisible by the number (71) formed by its first and last digit.

It is an amenable number.

7288221 is a deficient number, since it is larger than the sum of its proper divisors (2566563).

7288221 is a wasteful number, since it uses less digits than its factorization.

7288221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34291.

The product of its digits is 3584, while the sum is 30.

The square root of 7288221 is about 2699.6705354543. The cubic root of 7288221 is about 193.8833482299.

The spelling of 7288221 in words is "seven million, two hundred eighty-eight thousand, two hundred twenty-one".

Divisors: 1 3 71 213 34217 102651 2429407 7288221