7278145 has 8 divisors (see below), whose sum is σ = 9981504. Its totient is φ = 4990704.

The previous prime is 7278133. The next prime is 7278151. The reversal of 7278145 is 5418727.

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 7278145 - 2⁷ = 7278017 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

7278145 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 7278145.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 103939 + ... + 104008.

It is an arithmetic number, because the mean of its divisors is an integer number (1247688).

Almost surely, 2^7278145 is an apocalyptic number.

It is an amenable number.

7278145 is a deficient number, since it is larger than the sum of its proper divisors (2703359).

7278145 is a wasteful number, since it uses less digits than its factorization.

7278145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 207959.

The product of its digits is 15680, while the sum is 34.

The square root of 7278145 is about 2697.8037363752. The cubic root of 7278145 is about 193.7939588082.

The spelling of 7278145 in words is "seven million, two hundred seventy-eight thousand, one hundred forty-five".